# -*- coding: utf-8 -*- """Main IPython class.""" #----------------------------------------------------------------------------- # Copyright (C) 2001 Janko Hauser # Copyright (C) 2001-2007 Fernando Perez. # Copyright (C) 2008-2011 The IPython Development Team # # Distributed under the terms of the BSD License. The full license is in # the file COPYING, distributed as part of this software. #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Imports #----------------------------------------------------------------------------- from __future__ import with_statement from __future__ import absolute_import import __builtin__ import __future__ import abc import ast import atexit import codeop import inspect import os import re import sys import tempfile import types from contextlib import nested from IPython.config.configurable import Configurable from IPython.core import debugger, oinspect from IPython.core import history as ipcorehist from IPython.core import page from IPython.core import prefilter from IPython.core import shadowns from IPython.core import ultratb from IPython.core.alias import AliasManager from IPython.core.builtin_trap import BuiltinTrap from IPython.core.compilerop import CachingCompiler from IPython.core.display_trap import DisplayTrap from IPython.core.displayhook import DisplayHook from IPython.core.displaypub import DisplayPublisher from IPython.core.error import TryNext, UsageError from IPython.core.extensions import ExtensionManager from IPython.core.fakemodule import FakeModule, init_fakemod_dict from IPython.core.formatters import DisplayFormatter from IPython.core.history import HistoryManager from IPython.core.inputsplitter import IPythonInputSplitter from IPython.core.logger import Logger from IPython.core.macro import Macro from IPython.core.magic import Magic from IPython.core.payload import PayloadManager from IPython.core.plugin import PluginManager from IPython.core.prefilter import PrefilterManager, ESC_MAGIC from IPython.external.Itpl import ItplNS from IPython.utils import PyColorize from IPython.utils import io from IPython.utils.doctestreload import doctest_reload from IPython.utils.io import ask_yes_no, rprint from IPython.utils.ipstruct import Struct from IPython.utils.path import get_home_dir, get_ipython_dir, HomeDirError from IPython.utils.pickleshare import PickleShareDB from IPython.utils.process import system, getoutput from IPython.utils.strdispatch import StrDispatch from IPython.utils.syspathcontext import prepended_to_syspath from IPython.utils.text import num_ini_spaces, format_screen, LSString, SList from IPython.utils.traitlets import (Int, Str, CBool, CaselessStrEnum, Enum, List, Unicode, Instance, Type) from IPython.utils.warn import warn, error, fatal import IPython.core.hooks #----------------------------------------------------------------------------- # Globals #----------------------------------------------------------------------------- # compiled regexps for autoindent management dedent_re = re.compile(r'^\s+raise|^\s+return|^\s+pass') #----------------------------------------------------------------------------- # Utilities #----------------------------------------------------------------------------- # store the builtin raw_input globally, and use this always, in case user code # overwrites it (like wx.py.PyShell does) raw_input_original = raw_input def softspace(file, newvalue): """Copied from code.py, to remove the dependency""" oldvalue = 0 try: oldvalue = file.softspace except AttributeError: pass try: file.softspace = newvalue except (AttributeError, TypeError): # "attribute-less object" or "read-only attributes" pass return oldvalue def no_op(*a, **kw): pass class SpaceInInput(Exception): pass class Bunch: pass def get_default_colors(): if sys.platform=='darwin': return "LightBG" elif os.name=='nt': return 'Linux' else: return 'Linux' class SeparateStr(Str): """A Str subclass to validate separate_in, separate_out, etc. This is a Str based trait that converts '0'->'' and '\\n'->'\n'. """ def validate(self, obj, value): if value == '0': value = '' value = value.replace('\\n','\n') return super(SeparateStr, self).validate(obj, value) class MultipleInstanceError(Exception): pass class ReadlineNoRecord(object): """Context manager to execute some code, then reload readline history so that interactive input to the code doesn't appear when pressing up.""" def __init__(self, shell): self.shell = shell self._nested_level = 0 def __enter__(self): if self._nested_level == 0: self.orig_length = self.current_length() self.readline_tail = self.get_readline_tail() self._nested_level += 1 def __exit__(self, type, value, traceback): self._nested_level -= 1 if self._nested_level == 0: # Try clipping the end if it's got longer e = self.current_length() - self.orig_length if e > 0: for _ in range(e): self.shell.readline.remove_history_item(self.orig_length) # If it still doesn't match, just reload readline history. if self.current_length() != self.orig_length \ or self.get_readline_tail() != self.readline_tail: self.shell.refill_readline_hist() # Returning False will cause exceptions to propagate return False def current_length(self): return self.shell.readline.get_current_history_length() def get_readline_tail(self, n=10): """Get the last n items in readline history.""" end = self.shell.readline.get_current_history_length() + 1 start = max(end-n, 1) ghi = self.shell.readline.get_history_item return [ghi(x) for x in range(start, end)] #----------------------------------------------------------------------------- # Main IPython class #----------------------------------------------------------------------------- class InteractiveShell(Configurable, Magic): """An enhanced, interactive shell for Python.""" _instance = None autocall = Enum((0,1,2), default_value=1, config=True) # TODO: remove all autoindent logic and put into frontends. # We can't do this yet because even runlines uses the autoindent. autoindent = CBool(True, config=True) automagic = CBool(True, config=True) cache_size = Int(1000, config=True) color_info = CBool(True, config=True) colors = CaselessStrEnum(('NoColor','LightBG','Linux'), default_value=get_default_colors(), config=True) debug = CBool(False, config=True) deep_reload = CBool(False, config=True) display_formatter = Instance(DisplayFormatter) displayhook_class = Type(DisplayHook) display_pub_class = Type(DisplayPublisher) exit_now = CBool(False) # Monotonically increasing execution counter execution_count = Int(1) filename = Unicode("") ipython_dir= Unicode('', config=True) # Set to get_ipython_dir() in __init__ # Input splitter, to split entire cells of input into either individual # interactive statements or whole blocks. input_splitter = Instance('IPython.core.inputsplitter.IPythonInputSplitter', (), {}) logstart = CBool(False, config=True) logfile = Unicode('', config=True) logappend = Unicode('', config=True) object_info_string_level = Enum((0,1,2), default_value=0, config=True) pdb = CBool(False, config=True) profile = Unicode('', config=True) prompt_in1 = Str('In [\\#]: ', config=True) prompt_in2 = Str(' .\\D.: ', config=True) prompt_out = Str('Out[\\#]: ', config=True) prompts_pad_left = CBool(True, config=True) quiet = CBool(False, config=True) history_length = Int(10000, config=True) # The readline stuff will eventually be moved to the terminal subclass # but for now, we can't do that as readline is welded in everywhere. readline_use = CBool(True, config=True) readline_merge_completions = CBool(True, config=True) readline_omit__names = Enum((0,1,2), default_value=2, config=True) readline_remove_delims = Str('-/~', config=True) readline_parse_and_bind = List([ 'tab: complete', '"\C-l": clear-screen', 'set show-all-if-ambiguous on', '"\C-o": tab-insert', # See bug gh-58 - with \M-i enabled, chars 0x9000-0x9fff # crash IPython. '"\M-o": "\d\d\d\d"', '"\M-I": "\d\d\d\d"', '"\C-r": reverse-search-history', '"\C-s": forward-search-history', '"\C-p": history-search-backward', '"\C-n": history-search-forward', '"\e[A": history-search-backward', '"\e[B": history-search-forward', '"\C-k": kill-line', '"\C-u": unix-line-discard', ], allow_none=False, config=True) # TODO: this part of prompt management should be moved to the frontends. # Use custom TraitTypes that convert '0'->'' and '\\n'->'\n' separate_in = SeparateStr('\n', config=True) separate_out = SeparateStr('', config=True) separate_out2 = SeparateStr('', config=True) wildcards_case_sensitive = CBool(True, config=True) xmode = CaselessStrEnum(('Context','Plain', 'Verbose'), default_value='Context', config=True) # Subcomponents of InteractiveShell alias_manager = Instance('IPython.core.alias.AliasManager') prefilter_manager = Instance('IPython.core.prefilter.PrefilterManager') builtin_trap = Instance('IPython.core.builtin_trap.BuiltinTrap') display_trap = Instance('IPython.core.display_trap.DisplayTrap') extension_manager = Instance('IPython.core.extensions.ExtensionManager') plugin_manager = Instance('IPython.core.plugin.PluginManager') payload_manager = Instance('IPython.core.payload.PayloadManager') history_manager = Instance('IPython.core.history.HistoryManager') # Private interface _post_execute = set() def __init__(self, config=None, ipython_dir=None, user_ns=None, user_global_ns=None, custom_exceptions=((), None)): # This is where traits with a config_key argument are updated # from the values on config. super(InteractiveShell, self).__init__(config=config) # These are relatively independent and stateless self.init_ipython_dir(ipython_dir) self.init_instance_attrs() self.init_environment() # Create namespaces (user_ns, user_global_ns, etc.) self.init_create_namespaces(user_ns, user_global_ns) # This has to be done after init_create_namespaces because it uses # something in self.user_ns, but before init_sys_modules, which # is the first thing to modify sys. # TODO: When we override sys.stdout and sys.stderr before this class # is created, we are saving the overridden ones here. Not sure if this # is what we want to do. self.save_sys_module_state() self.init_sys_modules() # While we're trying to have each part of the code directly access what # it needs without keeping redundant references to objects, we have too # much legacy code that expects ip.db to exist. self.db = PickleShareDB(os.path.join(self.ipython_dir, 'db')) self.init_history() self.init_encoding() self.init_prefilter() Magic.__init__(self, self) self.init_syntax_highlighting() self.init_hooks() self.init_pushd_popd_magic() # self.init_traceback_handlers use to be here, but we moved it below # because it and init_io have to come after init_readline. self.init_user_ns() self.init_logger() self.init_alias() self.init_builtins() # pre_config_initialization # The next section should contain everything that was in ipmaker. self.init_logstart() # The following was in post_config_initialization self.init_inspector() # init_readline() must come before init_io(), because init_io uses # readline related things. self.init_readline() # init_completer must come after init_readline, because it needs to # know whether readline is present or not system-wide to configure the # completers, since the completion machinery can now operate # independently of readline (e.g. over the network) self.init_completer() # TODO: init_io() needs to happen before init_traceback handlers # because the traceback handlers hardcode the stdout/stderr streams. # This logic in in debugger.Pdb and should eventually be changed. self.init_io() self.init_traceback_handlers(custom_exceptions) self.init_prompts() self.init_display_formatter() self.init_display_pub() self.init_displayhook() self.init_reload_doctest() self.init_magics() self.init_pdb() self.init_extension_manager() self.init_plugin_manager() self.init_payload() self.hooks.late_startup_hook() atexit.register(self.atexit_operations) @classmethod def instance(cls, *args, **kwargs): """Returns a global InteractiveShell instance.""" if cls._instance is None: inst = cls(*args, **kwargs) # Now make sure that the instance will also be returned by # the subclasses instance attribute. for subclass in cls.mro(): if issubclass(cls, subclass) and \ issubclass(subclass, InteractiveShell): subclass._instance = inst else: break if isinstance(cls._instance, cls): return cls._instance else: raise MultipleInstanceError( 'Multiple incompatible subclass instances of ' 'InteractiveShell are being created.' ) @classmethod def initialized(cls): return hasattr(cls, "_instance") def get_ipython(self): """Return the currently running IPython instance.""" return self #------------------------------------------------------------------------- # Trait changed handlers #------------------------------------------------------------------------- def _ipython_dir_changed(self, name, new): if not os.path.isdir(new): os.makedirs(new, mode = 0777) def set_autoindent(self,value=None): """Set the autoindent flag, checking for readline support. If called with no arguments, it acts as a toggle.""" if not self.has_readline: if os.name == 'posix': warn("The auto-indent feature requires the readline library") self.autoindent = 0 return if value is None: self.autoindent = not self.autoindent else: self.autoindent = value #------------------------------------------------------------------------- # init_* methods called by __init__ #------------------------------------------------------------------------- def init_ipython_dir(self, ipython_dir): if ipython_dir is not None: self.ipython_dir = ipython_dir self.config.Global.ipython_dir = self.ipython_dir return if hasattr(self.config.Global, 'ipython_dir'): self.ipython_dir = self.config.Global.ipython_dir else: self.ipython_dir = get_ipython_dir() # All children can just read this self.config.Global.ipython_dir = self.ipython_dir def init_instance_attrs(self): self.more = False # command compiler self.compile = CachingCompiler() # User input buffers # NOTE: these variables are slated for full removal, once we are 100% # sure that the new execution logic is solid. We will delte runlines, # push_line and these buffers, as all input will be managed by the # frontends via an inputsplitter instance. self.buffer = [] self.buffer_raw = [] # Make an empty namespace, which extension writers can rely on both # existing and NEVER being used by ipython itself. This gives them a # convenient location for storing additional information and state # their extensions may require, without fear of collisions with other # ipython names that may develop later. self.meta = Struct() # Object variable to store code object waiting execution. This is # used mainly by the multithreaded shells, but it can come in handy in # other situations. No need to use a Queue here, since it's a single # item which gets cleared once run. self.code_to_run = None # Temporary files used for various purposes. Deleted at exit. self.tempfiles = [] # Keep track of readline usage (later set by init_readline) self.has_readline = False # keep track of where we started running (mainly for crash post-mortem) # This is not being used anywhere currently. self.starting_dir = os.getcwd() # Indentation management self.indent_current_nsp = 0 def init_environment(self): """Any changes we need to make to the user's environment.""" pass def init_encoding(self): # Get system encoding at startup time. Certain terminals (like Emacs # under Win32 have it set to None, and we need to have a known valid # encoding to use in the raw_input() method try: self.stdin_encoding = sys.stdin.encoding or 'ascii' except AttributeError: self.stdin_encoding = 'ascii' def init_syntax_highlighting(self): # Python source parser/formatter for syntax highlighting pyformat = PyColorize.Parser().format self.pycolorize = lambda src: pyformat(src,'str',self.colors) def init_pushd_popd_magic(self): # for pushd/popd management try: self.home_dir = get_home_dir() except HomeDirError, msg: fatal(msg) self.dir_stack = [] def init_logger(self): self.logger = Logger(self.home_dir, logfname='ipython_log.py', logmode='rotate') def init_logstart(self): """Initialize logging in case it was requested at the command line. """ if self.logappend: self.magic_logstart(self.logappend + ' append') elif self.logfile: self.magic_logstart(self.logfile) elif self.logstart: self.magic_logstart() def init_builtins(self): self.builtin_trap = BuiltinTrap(shell=self) def init_inspector(self): # Object inspector self.inspector = oinspect.Inspector(oinspect.InspectColors, PyColorize.ANSICodeColors, 'NoColor', self.object_info_string_level) def init_io(self): # This will just use sys.stdout and sys.stderr. If you want to # override sys.stdout and sys.stderr themselves, you need to do that # *before* instantiating this class, because Term holds onto # references to the underlying streams. if sys.platform == 'win32' and self.has_readline: Term = io.IOTerm(cout=self.readline._outputfile, cerr=self.readline._outputfile) else: Term = io.IOTerm() io.Term = Term def init_prompts(self): # TODO: This is a pass for now because the prompts are managed inside # the DisplayHook. Once there is a separate prompt manager, this # will initialize that object and all prompt related information. pass def init_display_formatter(self): self.display_formatter = DisplayFormatter(config=self.config) def init_display_pub(self): self.display_pub = self.display_pub_class(config=self.config) def init_displayhook(self): # Initialize displayhook, set in/out prompts and printing system self.displayhook = self.displayhook_class( config=self.config, shell=self, cache_size=self.cache_size, input_sep = self.separate_in, output_sep = self.separate_out, output_sep2 = self.separate_out2, ps1 = self.prompt_in1, ps2 = self.prompt_in2, ps_out = self.prompt_out, pad_left = self.prompts_pad_left ) # This is a context manager that installs/revmoes the displayhook at # the appropriate time. self.display_trap = DisplayTrap(hook=self.displayhook) def init_reload_doctest(self): # Do a proper resetting of doctest, including the necessary displayhook # monkeypatching try: doctest_reload() except ImportError: warn("doctest module does not exist.") #------------------------------------------------------------------------- # Things related to injections into the sys module #------------------------------------------------------------------------- def save_sys_module_state(self): """Save the state of hooks in the sys module. This has to be called after self.user_ns is created. """ self._orig_sys_module_state = {} self._orig_sys_module_state['stdin'] = sys.stdin self._orig_sys_module_state['stdout'] = sys.stdout self._orig_sys_module_state['stderr'] = sys.stderr self._orig_sys_module_state['excepthook'] = sys.excepthook try: self._orig_sys_modules_main_name = self.user_ns['__name__'] except KeyError: pass def restore_sys_module_state(self): """Restore the state of the sys module.""" try: for k, v in self._orig_sys_module_state.iteritems(): setattr(sys, k, v) except AttributeError: pass # Reset what what done in self.init_sys_modules try: sys.modules[self.user_ns['__name__']] = self._orig_sys_modules_main_name except (AttributeError, KeyError): pass #------------------------------------------------------------------------- # Things related to hooks #------------------------------------------------------------------------- def init_hooks(self): # hooks holds pointers used for user-side customizations self.hooks = Struct() self.strdispatchers = {} # Set all default hooks, defined in the IPython.hooks module. hooks = IPython.core.hooks for hook_name in hooks.__all__: # default hooks have priority 100, i.e. low; user hooks should have # 0-100 priority self.set_hook(hook_name,getattr(hooks,hook_name), 100) def set_hook(self,name,hook, priority = 50, str_key = None, re_key = None): """set_hook(name,hook) -> sets an internal IPython hook. IPython exposes some of its internal API as user-modifiable hooks. By adding your function to one of these hooks, you can modify IPython's behavior to call at runtime your own routines.""" # At some point in the future, this should validate the hook before it # accepts it. Probably at least check that the hook takes the number # of args it's supposed to. f = types.MethodType(hook,self) # check if the hook is for strdispatcher first if str_key is not None: sdp = self.strdispatchers.get(name, StrDispatch()) sdp.add_s(str_key, f, priority ) self.strdispatchers[name] = sdp return if re_key is not None: sdp = self.strdispatchers.get(name, StrDispatch()) sdp.add_re(re.compile(re_key), f, priority ) self.strdispatchers[name] = sdp return dp = getattr(self.hooks, name, None) if name not in IPython.core.hooks.__all__: print "Warning! Hook '%s' is not one of %s" % \ (name, IPython.core.hooks.__all__ ) if not dp: dp = IPython.core.hooks.CommandChainDispatcher() try: dp.add(f,priority) except AttributeError: # it was not commandchain, plain old func - replace dp = f setattr(self.hooks,name, dp) def register_post_execute(self, func): """Register a function for calling after code execution. """ if not callable(func): raise ValueError('argument %s must be callable' % func) self._post_execute.add(func) #------------------------------------------------------------------------- # Things related to the "main" module #------------------------------------------------------------------------- def new_main_mod(self,ns=None): """Return a new 'main' module object for user code execution. """ main_mod = self._user_main_module init_fakemod_dict(main_mod,ns) return main_mod def cache_main_mod(self,ns,fname): """Cache a main module's namespace. When scripts are executed via %run, we must keep a reference to the namespace of their __main__ module (a FakeModule instance) around so that Python doesn't clear it, rendering objects defined therein useless. This method keeps said reference in a private dict, keyed by the absolute path of the module object (which corresponds to the script path). This way, for multiple executions of the same script we only keep one copy of the namespace (the last one), thus preventing memory leaks from old references while allowing the objects from the last execution to be accessible. Note: we can not allow the actual FakeModule instances to be deleted, because of how Python tears down modules (it hard-sets all their references to None without regard for reference counts). This method must therefore make a *copy* of the given namespace, to allow the original module's __dict__ to be cleared and reused. Parameters ---------- ns : a namespace (a dict, typically) fname : str Filename associated with the namespace. Examples -------- In [10]: import IPython In [11]: _ip.cache_main_mod(IPython.__dict__,IPython.__file__) In [12]: IPython.__file__ in _ip._main_ns_cache Out[12]: True """ self._main_ns_cache[os.path.abspath(fname)] = ns.copy() def clear_main_mod_cache(self): """Clear the cache of main modules. Mainly for use by utilities like %reset. Examples -------- In [15]: import IPython In [16]: _ip.cache_main_mod(IPython.__dict__,IPython.__file__) In [17]: len(_ip._main_ns_cache) > 0 Out[17]: True In [18]: _ip.clear_main_mod_cache() In [19]: len(_ip._main_ns_cache) == 0 Out[19]: True """ self._main_ns_cache.clear() #------------------------------------------------------------------------- # Things related to debugging #------------------------------------------------------------------------- def init_pdb(self): # Set calling of pdb on exceptions # self.call_pdb is a property self.call_pdb = self.pdb def _get_call_pdb(self): return self._call_pdb def _set_call_pdb(self,val): if val not in (0,1,False,True): raise ValueError,'new call_pdb value must be boolean' # store value in instance self._call_pdb = val # notify the actual exception handlers self.InteractiveTB.call_pdb = val call_pdb = property(_get_call_pdb,_set_call_pdb,None, 'Control auto-activation of pdb at exceptions') def debugger(self,force=False): """Call the pydb/pdb debugger. Keywords: - force(False): by default, this routine checks the instance call_pdb flag and does not actually invoke the debugger if the flag is false. The 'force' option forces the debugger to activate even if the flag is false. """ if not (force or self.call_pdb): return if not hasattr(sys,'last_traceback'): error('No traceback has been produced, nothing to debug.') return # use pydb if available if debugger.has_pydb: from pydb import pm else: # fallback to our internal debugger pm = lambda : self.InteractiveTB.debugger(force=True) with self.readline_no_record: pm() #------------------------------------------------------------------------- # Things related to IPython's various namespaces #------------------------------------------------------------------------- def init_create_namespaces(self, user_ns=None, user_global_ns=None): # Create the namespace where the user will operate. user_ns is # normally the only one used, and it is passed to the exec calls as # the locals argument. But we do carry a user_global_ns namespace # given as the exec 'globals' argument, This is useful in embedding # situations where the ipython shell opens in a context where the # distinction between locals and globals is meaningful. For # non-embedded contexts, it is just the same object as the user_ns dict. # FIXME. For some strange reason, __builtins__ is showing up at user # level as a dict instead of a module. This is a manual fix, but I # should really track down where the problem is coming from. Alex # Schmolck reported this problem first. # A useful post by Alex Martelli on this topic: # Re: inconsistent value from __builtins__ # Von: Alex Martelli # Datum: Freitag 01 Oktober 2004 04:45:34 nachmittags/abends # Gruppen: comp.lang.python # Michael Hohn wrote: # > >>> print type(builtin_check.get_global_binding('__builtins__')) # > # > >>> print type(__builtins__) # > # > Is this difference in return value intentional? # Well, it's documented that '__builtins__' can be either a dictionary # or a module, and it's been that way for a long time. Whether it's # intentional (or sensible), I don't know. In any case, the idea is # that if you need to access the built-in namespace directly, you # should start with "import __builtin__" (note, no 's') which will # definitely give you a module. Yeah, it's somewhat confusing:-(. # These routines return properly built dicts as needed by the rest of # the code, and can also be used by extension writers to generate # properly initialized namespaces. user_ns, user_global_ns = self.make_user_namespaces(user_ns, user_global_ns) # Assign namespaces # This is the namespace where all normal user variables live self.user_ns = user_ns self.user_global_ns = user_global_ns # An auxiliary namespace that checks what parts of the user_ns were # loaded at startup, so we can list later only variables defined in # actual interactive use. Since it is always a subset of user_ns, it # doesn't need to be separately tracked in the ns_table. self.user_ns_hidden = {} # A namespace to keep track of internal data structures to prevent # them from cluttering user-visible stuff. Will be updated later self.internal_ns = {} # Now that FakeModule produces a real module, we've run into a nasty # problem: after script execution (via %run), the module where the user # code ran is deleted. Now that this object is a true module (needed # so docetst and other tools work correctly), the Python module # teardown mechanism runs over it, and sets to None every variable # present in that module. Top-level references to objects from the # script survive, because the user_ns is updated with them. However, # calling functions defined in the script that use other things from # the script will fail, because the function's closure had references # to the original objects, which are now all None. So we must protect # these modules from deletion by keeping a cache. # # To avoid keeping stale modules around (we only need the one from the # last run), we use a dict keyed with the full path to the script, so # only the last version of the module is held in the cache. Note, # however, that we must cache the module *namespace contents* (their # __dict__). Because if we try to cache the actual modules, old ones # (uncached) could be destroyed while still holding references (such as # those held by GUI objects that tend to be long-lived)> # # The %reset command will flush this cache. See the cache_main_mod() # and clear_main_mod_cache() methods for details on use. # This is the cache used for 'main' namespaces self._main_ns_cache = {} # And this is the single instance of FakeModule whose __dict__ we keep # copying and clearing for reuse on each %run self._user_main_module = FakeModule() # A table holding all the namespaces IPython deals with, so that # introspection facilities can search easily. self.ns_table = {'user':user_ns, 'user_global':user_global_ns, 'internal':self.internal_ns, 'builtin':__builtin__.__dict__ } # Similarly, track all namespaces where references can be held and that # we can safely clear (so it can NOT include builtin). This one can be # a simple list. Note that the main execution namespaces, user_ns and # user_global_ns, can NOT be listed here, as clearing them blindly # causes errors in object __del__ methods. Instead, the reset() method # clears them manually and carefully. self.ns_refs_table = [ self.user_ns_hidden, self.internal_ns, self._main_ns_cache ] def make_user_namespaces(self, user_ns=None, user_global_ns=None): """Return a valid local and global user interactive namespaces. This builds a dict with the minimal information needed to operate as a valid IPython user namespace, which you can pass to the various embedding classes in ipython. The default implementation returns the same dict for both the locals and the globals to allow functions to refer to variables in the namespace. Customized implementations can return different dicts. The locals dictionary can actually be anything following the basic mapping protocol of a dict, but the globals dict must be a true dict, not even a subclass. It is recommended that any custom object for the locals namespace synchronize with the globals dict somehow. Raises TypeError if the provided globals namespace is not a true dict. Parameters ---------- user_ns : dict-like, optional The current user namespace. The items in this namespace should be included in the output. If None, an appropriate blank namespace should be created. user_global_ns : dict, optional The current user global namespace. The items in this namespace should be included in the output. If None, an appropriate blank namespace should be created. Returns ------- A pair of dictionary-like object to be used as the local namespace of the interpreter and a dict to be used as the global namespace. """ # We must ensure that __builtin__ (without the final 's') is always # available and pointing to the __builtin__ *module*. For more details: # http://mail.python.org/pipermail/python-dev/2001-April/014068.html if user_ns is None: # Set __name__ to __main__ to better match the behavior of the # normal interpreter. user_ns = {'__name__' :'__main__', '__builtin__' : __builtin__, '__builtins__' : __builtin__, } else: user_ns.setdefault('__name__','__main__') user_ns.setdefault('__builtin__',__builtin__) user_ns.setdefault('__builtins__',__builtin__) if user_global_ns is None: user_global_ns = user_ns if type(user_global_ns) is not dict: raise TypeError("user_global_ns must be a true dict; got %r" % type(user_global_ns)) return user_ns, user_global_ns def init_sys_modules(self): # We need to insert into sys.modules something that looks like a # module but which accesses the IPython namespace, for shelve and # pickle to work interactively. Normally they rely on getting # everything out of __main__, but for embedding purposes each IPython # instance has its own private namespace, so we can't go shoving # everything into __main__. # note, however, that we should only do this for non-embedded # ipythons, which really mimic the __main__.__dict__ with their own # namespace. Embedded instances, on the other hand, should not do # this because they need to manage the user local/global namespaces # only, but they live within a 'normal' __main__ (meaning, they # shouldn't overtake the execution environment of the script they're # embedded in). # This is overridden in the InteractiveShellEmbed subclass to a no-op. try: main_name = self.user_ns['__name__'] except KeyError: raise KeyError('user_ns dictionary MUST have a "__name__" key') else: sys.modules[main_name] = FakeModule(self.user_ns) def init_user_ns(self): """Initialize all user-visible namespaces to their minimum defaults. Certain history lists are also initialized here, as they effectively act as user namespaces. Notes ----- All data structures here are only filled in, they are NOT reset by this method. If they were not empty before, data will simply be added to therm. """ # This function works in two parts: first we put a few things in # user_ns, and we sync that contents into user_ns_hidden so that these # initial variables aren't shown by %who. After the sync, we add the # rest of what we *do* want the user to see with %who even on a new # session (probably nothing, so theye really only see their own stuff) # The user dict must *always* have a __builtin__ reference to the # Python standard __builtin__ namespace, which must be imported. # This is so that certain operations in prompt evaluation can be # reliably executed with builtins. Note that we can NOT use # __builtins__ (note the 's'), because that can either be a dict or a # module, and can even mutate at runtime, depending on the context # (Python makes no guarantees on it). In contrast, __builtin__ is # always a module object, though it must be explicitly imported. # For more details: # http://mail.python.org/pipermail/python-dev/2001-April/014068.html ns = dict(__builtin__ = __builtin__) # Put 'help' in the user namespace try: from site import _Helper ns['help'] = _Helper() except ImportError: warn('help() not available - check site.py') # make global variables for user access to the histories ns['_ih'] = self.history_manager.input_hist_parsed ns['_oh'] = self.history_manager.output_hist ns['_dh'] = self.history_manager.dir_hist ns['_sh'] = shadowns # user aliases to input and output histories. These shouldn't show up # in %who, as they can have very large reprs. ns['In'] = self.history_manager.input_hist_parsed ns['Out'] = self.history_manager.output_hist # Store myself as the public api!!! ns['get_ipython'] = self.get_ipython # Sync what we've added so far to user_ns_hidden so these aren't seen # by %who self.user_ns_hidden.update(ns) # Anything put into ns now would show up in %who. Think twice before # putting anything here, as we really want %who to show the user their # stuff, not our variables. # Finally, update the real user's namespace self.user_ns.update(ns) def reset(self, new_session=True): """Clear all internal namespaces. Note that this is much more aggressive than %reset, since it clears fully all namespaces, as well as all input/output lists. If new_session is True, a new history session will be opened. """ # Clear histories self.history_manager.reset(new_session) # Reset counter used to index all histories self.execution_count = 0 # Restore the user namespaces to minimal usability for ns in self.ns_refs_table: ns.clear() # The main execution namespaces must be cleared very carefully, # skipping the deletion of the builtin-related keys, because doing so # would cause errors in many object's __del__ methods. for ns in [self.user_ns, self.user_global_ns]: drop_keys = set(ns.keys()) drop_keys.discard('__builtin__') drop_keys.discard('__builtins__') for k in drop_keys: del ns[k] # Restore the user namespaces to minimal usability self.init_user_ns() # Restore the default and user aliases self.alias_manager.clear_aliases() self.alias_manager.init_aliases() def reset_selective(self, regex=None): """Clear selective variables from internal namespaces based on a specified regular expression. Parameters ---------- regex : string or compiled pattern, optional A regular expression pattern that will be used in searching variable names in the users namespaces. """ if regex is not None: try: m = re.compile(regex) except TypeError: raise TypeError('regex must be a string or compiled pattern') # Search for keys in each namespace that match the given regex # If a match is found, delete the key/value pair. for ns in self.ns_refs_table: for var in ns: if m.search(var): del ns[var] def push(self, variables, interactive=True): """Inject a group of variables into the IPython user namespace. Parameters ---------- variables : dict, str or list/tuple of str The variables to inject into the user's namespace. If a dict, a simple update is done. If a str, the string is assumed to have variable names separated by spaces. A list/tuple of str can also be used to give the variable names. If just the variable names are give (list/tuple/str) then the variable values looked up in the callers frame. interactive : bool If True (default), the variables will be listed with the ``who`` magic. """ vdict = None # We need a dict of name/value pairs to do namespace updates. if isinstance(variables, dict): vdict = variables elif isinstance(variables, (basestring, list, tuple)): if isinstance(variables, basestring): vlist = variables.split() else: vlist = variables vdict = {} cf = sys._getframe(1) for name in vlist: try: vdict[name] = eval(name, cf.f_globals, cf.f_locals) except: print ('Could not get variable %s from %s' % (name,cf.f_code.co_name)) else: raise ValueError('variables must be a dict/str/list/tuple') # Propagate variables to user namespace self.user_ns.update(vdict) # And configure interactive visibility config_ns = self.user_ns_hidden if interactive: for name, val in vdict.iteritems(): config_ns.pop(name, None) else: for name,val in vdict.iteritems(): config_ns[name] = val #------------------------------------------------------------------------- # Things related to object introspection #------------------------------------------------------------------------- def _ofind(self, oname, namespaces=None): """Find an object in the available namespaces. self._ofind(oname) -> dict with keys: found,obj,ospace,ismagic Has special code to detect magic functions. """ #oname = oname.strip() #print '1- oname: <%r>' % oname # dbg try: oname = oname.strip().encode('ascii') #print '2- oname: <%r>' % oname # dbg except UnicodeEncodeError: print 'Python identifiers can only contain ascii characters.' return dict(found=False) alias_ns = None if namespaces is None: # Namespaces to search in: # Put them in a list. The order is important so that we # find things in the same order that Python finds them. namespaces = [ ('Interactive', self.user_ns), ('IPython internal', self.internal_ns), ('Python builtin', __builtin__.__dict__), ('Alias', self.alias_manager.alias_table), ] alias_ns = self.alias_manager.alias_table # initialize results to 'null' found = False; obj = None; ospace = None; ds = None; ismagic = False; isalias = False; parent = None # We need to special-case 'print', which as of python2.6 registers as a # function but should only be treated as one if print_function was # loaded with a future import. In this case, just bail. if (oname == 'print' and not (self.compile.compiler_flags & __future__.CO_FUTURE_PRINT_FUNCTION)): return {'found':found, 'obj':obj, 'namespace':ospace, 'ismagic':ismagic, 'isalias':isalias, 'parent':parent} # Look for the given name by splitting it in parts. If the head is # found, then we look for all the remaining parts as members, and only # declare success if we can find them all. oname_parts = oname.split('.') oname_head, oname_rest = oname_parts[0],oname_parts[1:] for nsname,ns in namespaces: try: obj = ns[oname_head] except KeyError: continue else: #print 'oname_rest:', oname_rest # dbg for part in oname_rest: try: parent = obj obj = getattr(obj,part) except: # Blanket except b/c some badly implemented objects # allow __getattr__ to raise exceptions other than # AttributeError, which then crashes IPython. break else: # If we finish the for loop (no break), we got all members found = True ospace = nsname if ns == alias_ns: isalias = True break # namespace loop # Try to see if it's magic if not found: if oname.startswith(ESC_MAGIC): oname = oname[1:] obj = getattr(self,'magic_'+oname,None) if obj is not None: found = True ospace = 'IPython internal' ismagic = True # Last try: special-case some literals like '', [], {}, etc: if not found and oname_head in ["''",'""','[]','{}','()']: obj = eval(oname_head) found = True ospace = 'Interactive' return {'found':found, 'obj':obj, 'namespace':ospace, 'ismagic':ismagic, 'isalias':isalias, 'parent':parent} def _ofind_property(self, oname, info): """Second part of object finding, to look for property details.""" if info.found: # Get the docstring of the class property if it exists. path = oname.split('.') root = '.'.join(path[:-1]) if info.parent is not None: try: target = getattr(info.parent, '__class__') # The object belongs to a class instance. try: target = getattr(target, path[-1]) # The class defines the object. if isinstance(target, property): oname = root + '.__class__.' + path[-1] info = Struct(self._ofind(oname)) except AttributeError: pass except AttributeError: pass # We return either the new info or the unmodified input if the object # hadn't been found return info def _object_find(self, oname, namespaces=None): """Find an object and return a struct with info about it.""" inf = Struct(self._ofind(oname, namespaces)) return Struct(self._ofind_property(oname, inf)) def _inspect(self, meth, oname, namespaces=None, **kw): """Generic interface to the inspector system. This function is meant to be called by pdef, pdoc & friends.""" info = self._object_find(oname) if info.found: pmethod = getattr(self.inspector, meth) formatter = format_screen if info.ismagic else None if meth == 'pdoc': pmethod(info.obj, oname, formatter) elif meth == 'pinfo': pmethod(info.obj, oname, formatter, info, **kw) else: pmethod(info.obj, oname) else: print 'Object `%s` not found.' % oname return 'not found' # so callers can take other action def object_inspect(self, oname): info = self._object_find(oname) if info.found: return self.inspector.info(info.obj, oname, info=info) else: return oinspect.object_info(name=oname, found=False) #------------------------------------------------------------------------- # Things related to history management #------------------------------------------------------------------------- def init_history(self): """Sets up the command history, and starts regular autosaves.""" self.history_manager = HistoryManager(shell=self, config=self.config) #------------------------------------------------------------------------- # Things related to exception handling and tracebacks (not debugging) #------------------------------------------------------------------------- def init_traceback_handlers(self, custom_exceptions): # Syntax error handler. self.SyntaxTB = ultratb.SyntaxTB(color_scheme='NoColor') # The interactive one is initialized with an offset, meaning we always # want to remove the topmost item in the traceback, which is our own # internal code. Valid modes: ['Plain','Context','Verbose'] self.InteractiveTB = ultratb.AutoFormattedTB(mode = 'Plain', color_scheme='NoColor', tb_offset = 1, check_cache=self.compile.check_cache) # The instance will store a pointer to the system-wide exception hook, # so that runtime code (such as magics) can access it. This is because # during the read-eval loop, it may get temporarily overwritten. self.sys_excepthook = sys.excepthook # and add any custom exception handlers the user may have specified self.set_custom_exc(*custom_exceptions) # Set the exception mode self.InteractiveTB.set_mode(mode=self.xmode) def set_custom_exc(self, exc_tuple, handler): """set_custom_exc(exc_tuple,handler) Set a custom exception handler, which will be called if any of the exceptions in exc_tuple occur in the mainloop (specifically, in the run_code() method. Inputs: - exc_tuple: a *tuple* of valid exceptions to call the defined handler for. It is very important that you use a tuple, and NOT A LIST here, because of the way Python's except statement works. If you only want to trap a single exception, use a singleton tuple: exc_tuple == (MyCustomException,) - handler: this must be defined as a function with the following basic interface:: def my_handler(self, etype, value, tb, tb_offset=None) ... # The return value must be return structured_traceback This will be made into an instance method (via types.MethodType) of IPython itself, and it will be called if any of the exceptions listed in the exc_tuple are caught. If the handler is None, an internal basic one is used, which just prints basic info. WARNING: by putting in your own exception handler into IPython's main execution loop, you run a very good chance of nasty crashes. This facility should only be used if you really know what you are doing.""" assert type(exc_tuple)==type(()) , \ "The custom exceptions must be given AS A TUPLE." def dummy_handler(self,etype,value,tb): print '*** Simple custom exception handler ***' print 'Exception type :',etype print 'Exception value:',value print 'Traceback :',tb print 'Source code :','\n'.join(self.buffer) if handler is None: handler = dummy_handler self.CustomTB = types.MethodType(handler,self) self.custom_exceptions = exc_tuple def excepthook(self, etype, value, tb): """One more defense for GUI apps that call sys.excepthook. GUI frameworks like wxPython trap exceptions and call sys.excepthook themselves. I guess this is a feature that enables them to keep running after exceptions that would otherwise kill their mainloop. This is a bother for IPython which excepts to catch all of the program exceptions with a try: except: statement. Normally, IPython sets sys.excepthook to a CrashHandler instance, so if any app directly invokes sys.excepthook, it will look to the user like IPython crashed. In order to work around this, we can disable the CrashHandler and replace it with this excepthook instead, which prints a regular traceback using our InteractiveTB. In this fashion, apps which call sys.excepthook will generate a regular-looking exception from IPython, and the CrashHandler will only be triggered by real IPython crashes. This hook should be used sparingly, only in places which are not likely to be true IPython errors. """ self.showtraceback((etype,value,tb),tb_offset=0) def showtraceback(self,exc_tuple = None,filename=None,tb_offset=None, exception_only=False): """Display the exception that just occurred. If nothing is known about the exception, this is the method which should be used throughout the code for presenting user tracebacks, rather than directly invoking the InteractiveTB object. A specific showsyntaxerror() also exists, but this method can take care of calling it if needed, so unless you are explicitly catching a SyntaxError exception, don't try to analyze the stack manually and simply call this method.""" try: if exc_tuple is None: etype, value, tb = sys.exc_info() else: etype, value, tb = exc_tuple if etype is None: if hasattr(sys, 'last_type'): etype, value, tb = sys.last_type, sys.last_value, \ sys.last_traceback else: self.write_err('No traceback available to show.\n') return if etype is SyntaxError: # Though this won't be called by syntax errors in the input # line, there may be SyntaxError cases whith imported code. self.showsyntaxerror(filename) elif etype is UsageError: print "UsageError:", value else: # WARNING: these variables are somewhat deprecated and not # necessarily safe to use in a threaded environment, but tools # like pdb depend on their existence, so let's set them. If we # find problems in the field, we'll need to revisit their use. sys.last_type = etype sys.last_value = value sys.last_traceback = tb if etype in self.custom_exceptions: # FIXME: Old custom traceback objects may just return a # string, in that case we just put it into a list stb = self.CustomTB(etype, value, tb, tb_offset) if isinstance(ctb, basestring): stb = [stb] else: if exception_only: stb = ['An exception has occurred, use %tb to see ' 'the full traceback.\n'] stb.extend(self.InteractiveTB.get_exception_only(etype, value)) else: stb = self.InteractiveTB.structured_traceback(etype, value, tb, tb_offset=tb_offset) # FIXME: the pdb calling should be done by us, not by # the code computing the traceback. if self.InteractiveTB.call_pdb: # pdb mucks up readline, fix it back self.set_readline_completer() # Actually show the traceback self._showtraceback(etype, value, stb) except KeyboardInterrupt: self.write_err("\nKeyboardInterrupt\n") def _showtraceback(self, etype, evalue, stb): """Actually show a traceback. Subclasses may override this method to put the traceback on a different place, like a side channel. """ print >> io.Term.cout, self.InteractiveTB.stb2text(stb) def showsyntaxerror(self, filename=None): """Display the syntax error that just occurred. This doesn't display a stack trace because there isn't one. If a filename is given, it is stuffed in the exception instead of what was there before (because Python's parser always uses "" when reading from a string). """ etype, value, last_traceback = sys.exc_info() # See note about these variables in showtraceback() above sys.last_type = etype sys.last_value = value sys.last_traceback = last_traceback if filename and etype is SyntaxError: # Work hard to stuff the correct filename in the exception try: msg, (dummy_filename, lineno, offset, line) = value except: # Not the format we expect; leave it alone pass else: # Stuff in the right filename try: # Assume SyntaxError is a class exception value = SyntaxError(msg, (filename, lineno, offset, line)) except: # If that failed, assume SyntaxError is a string value = msg, (filename, lineno, offset, line) stb = self.SyntaxTB.structured_traceback(etype, value, []) self._showtraceback(etype, value, stb) #------------------------------------------------------------------------- # Things related to readline #------------------------------------------------------------------------- def init_readline(self): """Command history completion/saving/reloading.""" if self.readline_use: import IPython.utils.rlineimpl as readline self.rl_next_input = None self.rl_do_indent = False if not self.readline_use or not readline.have_readline: self.has_readline = False self.readline = None # Set a number of methods that depend on readline to be no-op self.set_readline_completer = no_op self.set_custom_completer = no_op self.set_completer_frame = no_op warn('Readline services not available or not loaded.') else: self.has_readline = True self.readline = readline sys.modules['readline'] = readline # Platform-specific configuration if os.name == 'nt': # FIXME - check with Frederick to see if we can harmonize # naming conventions with pyreadline to avoid this # platform-dependent check self.readline_startup_hook = readline.set_pre_input_hook else: self.readline_startup_hook = readline.set_startup_hook # Load user's initrc file (readline config) # Or if libedit is used, load editrc. inputrc_name = os.environ.get('INPUTRC') if inputrc_name is None: home_dir = get_home_dir() if home_dir is not None: inputrc_name = '.inputrc' if readline.uses_libedit: inputrc_name = '.editrc' inputrc_name = os.path.join(home_dir, inputrc_name) if os.path.isfile(inputrc_name): try: readline.read_init_file(inputrc_name) except: warn('Problems reading readline initialization file <%s>' % inputrc_name) # Configure readline according to user's prefs # This is only done if GNU readline is being used. If libedit # is being used (as on Leopard) the readline config is # not run as the syntax for libedit is different. if not readline.uses_libedit: for rlcommand in self.readline_parse_and_bind: #print "loading rl:",rlcommand # dbg readline.parse_and_bind(rlcommand) # Remove some chars from the delimiters list. If we encounter # unicode chars, discard them. delims = readline.get_completer_delims().encode("ascii", "ignore") delims = delims.translate(None, self.readline_remove_delims) delims = delims.replace(ESC_MAGIC, '') readline.set_completer_delims(delims) # otherwise we end up with a monster history after a while: readline.set_history_length(self.history_length) self.refill_readline_hist() self.readline_no_record = ReadlineNoRecord(self) # Configure auto-indent for all platforms self.set_autoindent(self.autoindent) def refill_readline_hist(self): # Load the last 1000 lines from history self.readline.clear_history() stdin_encoding = sys.stdin.encoding or "utf-8" for _, _, cell in self.history_manager.get_tail(1000, include_latest=True): if cell.strip(): # Ignore blank lines for line in cell.splitlines(): self.readline.add_history(line.encode(stdin_encoding)) def set_next_input(self, s): """ Sets the 'default' input string for the next command line. Requires readline. Example: [D:\ipython]|1> _ip.set_next_input("Hello Word") [D:\ipython]|2> Hello Word_ # cursor is here """ self.rl_next_input = s # Maybe move this to the terminal subclass? def pre_readline(self): """readline hook to be used at the start of each line. Currently it handles auto-indent only.""" if self.rl_do_indent: self.readline.insert_text(self._indent_current_str()) if self.rl_next_input is not None: self.readline.insert_text(self.rl_next_input) self.rl_next_input = None def _indent_current_str(self): """return the current level of indentation as a string""" return self.input_splitter.indent_spaces * ' ' #------------------------------------------------------------------------- # Things related to text completion #------------------------------------------------------------------------- def init_completer(self): """Initialize the completion machinery. This creates completion machinery that can be used by client code, either interactively in-process (typically triggered by the readline library), programatically (such as in test suites) or out-of-prcess (typically over the network by remote frontends). """ from IPython.core.completer import IPCompleter from IPython.core.completerlib import (module_completer, magic_run_completer, cd_completer) self.Completer = IPCompleter(self, self.user_ns, self.user_global_ns, self.readline_omit__names, self.alias_manager.alias_table, self.has_readline) # Add custom completers to the basic ones built into IPCompleter sdisp = self.strdispatchers.get('complete_command', StrDispatch()) self.strdispatchers['complete_command'] = sdisp self.Completer.custom_completers = sdisp self.set_hook('complete_command', module_completer, str_key = 'import') self.set_hook('complete_command', module_completer, str_key = 'from') self.set_hook('complete_command', magic_run_completer, str_key = '%run') self.set_hook('complete_command', cd_completer, str_key = '%cd') # Only configure readline if we truly are using readline. IPython can # do tab-completion over the network, in GUIs, etc, where readline # itself may be absent if self.has_readline: self.set_readline_completer() def complete(self, text, line=None, cursor_pos=None): """Return the completed text and a list of completions. Parameters ---------- text : string A string of text to be completed on. It can be given as empty and instead a line/position pair are given. In this case, the completer itself will split the line like readline does. line : string, optional The complete line that text is part of. cursor_pos : int, optional The position of the cursor on the input line. Returns ------- text : string The actual text that was completed. matches : list A sorted list with all possible completions. The optional arguments allow the completion to take more context into account, and are part of the low-level completion API. This is a wrapper around the completion mechanism, similar to what readline does at the command line when the TAB key is hit. By exposing it as a method, it can be used by other non-readline environments (such as GUIs) for text completion. Simple usage example: In [1]: x = 'hello' In [2]: _ip.complete('x.l') Out[2]: ('x.l', ['x.ljust', 'x.lower', 'x.lstrip']) """ # Inject names into __builtin__ so we can complete on the added names. with self.builtin_trap: return self.Completer.complete(text, line, cursor_pos) def set_custom_completer(self, completer, pos=0): """Adds a new custom completer function. The position argument (defaults to 0) is the index in the completers list where you want the completer to be inserted.""" newcomp = types.MethodType(completer,self.Completer) self.Completer.matchers.insert(pos,newcomp) def set_readline_completer(self): """Reset readline's completer to be our own.""" self.readline.set_completer(self.Completer.rlcomplete) def set_completer_frame(self, frame=None): """Set the frame of the completer.""" if frame: self.Completer.namespace = frame.f_locals self.Completer.global_namespace = frame.f_globals else: self.Completer.namespace = self.user_ns self.Completer.global_namespace = self.user_global_ns #------------------------------------------------------------------------- # Things related to magics #------------------------------------------------------------------------- def init_magics(self): # FIXME: Move the color initialization to the DisplayHook, which # should be split into a prompt manager and displayhook. We probably # even need a centralize colors management object. self.magic_colors(self.colors) # History was moved to a separate module from . import history history.init_ipython(self) def magic(self,arg_s): """Call a magic function by name. Input: a string containing the name of the magic function to call and any additional arguments to be passed to the magic. magic('name -opt foo bar') is equivalent to typing at the ipython prompt: In[1]: %name -opt foo bar To call a magic without arguments, simply use magic('name'). This provides a proper Python function to call IPython's magics in any valid Python code you can type at the interpreter, including loops and compound statements. """ args = arg_s.split(' ',1) magic_name = args[0] magic_name = magic_name.lstrip(prefilter.ESC_MAGIC) try: magic_args = args[1] except IndexError: magic_args = '' fn = getattr(self,'magic_'+magic_name,None) if fn is None: error("Magic function `%s` not found." % magic_name) else: magic_args = self.var_expand(magic_args,1) # Grab local namespace if we need it: if getattr(fn, "needs_local_scope", False): self._magic_locals = sys._getframe(1).f_locals with nested(self.builtin_trap,): result = fn(magic_args) # Ensure we're not keeping object references around: self._magic_locals = {} return result def define_magic(self, magicname, func): """Expose own function as magic function for ipython def foo_impl(self,parameter_s=''): 'My very own magic!. (Use docstrings, IPython reads them).' print 'Magic function. Passed parameter is between < >:' print '<%s>' % parameter_s print 'The self object is:',self self.define_magic('foo',foo_impl) """ import new im = types.MethodType(func,self) old = getattr(self, "magic_" + magicname, None) setattr(self, "magic_" + magicname, im) return old #------------------------------------------------------------------------- # Things related to macros #------------------------------------------------------------------------- def define_macro(self, name, themacro): """Define a new macro Parameters ---------- name : str The name of the macro. themacro : str or Macro The action to do upon invoking the macro. If a string, a new Macro object is created by passing the string to it. """ from IPython.core import macro if isinstance(themacro, basestring): themacro = macro.Macro(themacro) if not isinstance(themacro, macro.Macro): raise ValueError('A macro must be a string or a Macro instance.') self.user_ns[name] = themacro #------------------------------------------------------------------------- # Things related to the running of system commands #------------------------------------------------------------------------- def system(self, cmd): """Call the given cmd in a subprocess. Parameters ---------- cmd : str Command to execute (can not end in '&', as bacground processes are not supported. """ # We do not support backgrounding processes because we either use # pexpect or pipes to read from. Users can always just call # os.system() if they really want a background process. if cmd.endswith('&'): raise OSError("Background processes not supported.") return system(self.var_expand(cmd, depth=2)) def getoutput(self, cmd, split=True): """Get output (possibly including stderr) from a subprocess. Parameters ---------- cmd : str Command to execute (can not end in '&', as background processes are not supported. split : bool, optional If True, split the output into an IPython SList. Otherwise, an IPython LSString is returned. These are objects similar to normal lists and strings, with a few convenience attributes for easier manipulation of line-based output. You can use '?' on them for details. """ if cmd.endswith('&'): raise OSError("Background processes not supported.") out = getoutput(self.var_expand(cmd, depth=2)) if split: out = SList(out.splitlines()) else: out = LSString(out) return out #------------------------------------------------------------------------- # Things related to aliases #------------------------------------------------------------------------- def init_alias(self): self.alias_manager = AliasManager(shell=self, config=self.config) self.ns_table['alias'] = self.alias_manager.alias_table, #------------------------------------------------------------------------- # Things related to extensions and plugins #------------------------------------------------------------------------- def init_extension_manager(self): self.extension_manager = ExtensionManager(shell=self, config=self.config) def init_plugin_manager(self): self.plugin_manager = PluginManager(config=self.config) #------------------------------------------------------------------------- # Things related to payloads #------------------------------------------------------------------------- def init_payload(self): self.payload_manager = PayloadManager(config=self.config) #------------------------------------------------------------------------- # Things related to the prefilter #------------------------------------------------------------------------- def init_prefilter(self): self.prefilter_manager = PrefilterManager(shell=self, config=self.config) # Ultimately this will be refactored in the new interpreter code, but # for now, we should expose the main prefilter method (there's legacy # code out there that may rely on this). self.prefilter = self.prefilter_manager.prefilter_lines def auto_rewrite_input(self, cmd): """Print to the screen the rewritten form of the user's command. This shows visual feedback by rewriting input lines that cause automatic calling to kick in, like:: /f x into:: ------> f(x) after the user's input prompt. This helps the user understand that the input line was transformed automatically by IPython. """ rw = self.displayhook.prompt1.auto_rewrite() + cmd try: # plain ascii works better w/ pyreadline, on some machines, so # we use it and only print uncolored rewrite if we have unicode rw = str(rw) print >> IPython.utils.io.Term.cout, rw except UnicodeEncodeError: print "------> " + cmd #------------------------------------------------------------------------- # Things related to extracting values/expressions from kernel and user_ns #------------------------------------------------------------------------- def _simple_error(self): etype, value = sys.exc_info()[:2] return u'[ERROR] {e.__name__}: {v}'.format(e=etype, v=value) def user_variables(self, names): """Get a list of variable names from the user's namespace. Parameters ---------- names : list of strings A list of names of variables to be read from the user namespace. Returns ------- A dict, keyed by the input names and with the repr() of each value. """ out = {} user_ns = self.user_ns for varname in names: try: value = repr(user_ns[varname]) except: value = self._simple_error() out[varname] = value return out def user_expressions(self, expressions): """Evaluate a dict of expressions in the user's namespace. Parameters ---------- expressions : dict A dict with string keys and string values. The expression values should be valid Python expressions, each of which will be evaluated in the user namespace. Returns ------- A dict, keyed like the input expressions dict, with the repr() of each value. """ out = {} user_ns = self.user_ns global_ns = self.user_global_ns for key, expr in expressions.iteritems(): try: value = repr(eval(expr, global_ns, user_ns)) except: value = self._simple_error() out[key] = value return out #------------------------------------------------------------------------- # Things related to the running of code #------------------------------------------------------------------------- def ex(self, cmd): """Execute a normal python statement in user namespace.""" with nested(self.builtin_trap,): exec cmd in self.user_global_ns, self.user_ns def ev(self, expr): """Evaluate python expression expr in user namespace. Returns the result of evaluation """ with nested(self.builtin_trap,): return eval(expr, self.user_global_ns, self.user_ns) def safe_execfile(self, fname, *where, **kw): """A safe version of the builtin execfile(). This version will never throw an exception, but instead print helpful error messages to the screen. This only works on pure Python files with the .py extension. Parameters ---------- fname : string The name of the file to be executed. where : tuple One or two namespaces, passed to execfile() as (globals,locals). If only one is given, it is passed as both. exit_ignore : bool (False) If True, then silence SystemExit for non-zero status (it is always silenced for zero status, as it is so common). """ kw.setdefault('exit_ignore', False) fname = os.path.abspath(os.path.expanduser(fname)) # Make sure we have a .py file if not fname.endswith('.py'): warn('File must end with .py to be run using execfile: <%s>' % fname) # Make sure we can open the file try: with open(fname) as thefile: pass except: warn('Could not open file <%s> for safe execution.' % fname) return # Find things also in current directory. This is needed to mimic the # behavior of running a script from the system command line, where # Python inserts the script's directory into sys.path dname = os.path.dirname(fname) if isinstance(fname, unicode): # execfile uses default encoding instead of filesystem encoding # so unicode filenames will fail fname = fname.encode(sys.getfilesystemencoding() or sys.getdefaultencoding()) with prepended_to_syspath(dname): try: execfile(fname,*where) except SystemExit, status: # If the call was made with 0 or None exit status (sys.exit(0) # or sys.exit() ), don't bother showing a traceback, as both of # these are considered normal by the OS: # > python -c'import sys;sys.exit(0)'; echo $? # 0 # > python -c'import sys;sys.exit()'; echo $? # 0 # For other exit status, we show the exception unless # explicitly silenced, but only in short form. if status.code not in (0, None) and not kw['exit_ignore']: self.showtraceback(exception_only=True) except: self.showtraceback() def safe_execfile_ipy(self, fname): """Like safe_execfile, but for .ipy files with IPython syntax. Parameters ---------- fname : str The name of the file to execute. The filename must have a .ipy extension. """ fname = os.path.abspath(os.path.expanduser(fname)) # Make sure we have a .py file if not fname.endswith('.ipy'): warn('File must end with .py to be run using execfile: <%s>' % fname) # Make sure we can open the file try: with open(fname) as thefile: pass except: warn('Could not open file <%s> for safe execution.' % fname) return # Find things also in current directory. This is needed to mimic the # behavior of running a script from the system command line, where # Python inserts the script's directory into sys.path dname = os.path.dirname(fname) with prepended_to_syspath(dname): try: with open(fname) as thefile: # self.run_cell currently captures all exceptions # raised in user code. It would be nice if there were # versions of runlines, execfile that did raise, so # we could catch the errors. self.run_cell(thefile.read(), store_history=False) except: self.showtraceback() warn('Unknown failure executing file: <%s>' % fname) def run_cell(self, cell, store_history=True): """Run a complete IPython cell. Parameters ---------- cell : str The code (including IPython code such as %magic functions) to run. store_history : bool If True, the raw and translated cell will be stored in IPython's history. For user code calling back into IPython's machinery, this should be set to False. """ raw_cell = cell with self.builtin_trap: cell = self.prefilter_manager.prefilter_lines(cell) # Store raw and processed history if store_history: self.history_manager.store_inputs(self.execution_count, cell, raw_cell) self.logger.log(cell, raw_cell) cell_name = self.compile.cache(cell, self.execution_count) with self.display_trap: try: code_ast = ast.parse(cell, filename=cell_name) except (OverflowError, SyntaxError, ValueError, TypeError, MemoryError): # Case 1 self.showsyntaxerror() self.execution_count += 1 return None interactivity = 'last' # Last node to be run interactive if len(cell.splitlines()) == 1: interactivity = 'all' # Single line; run fully interactive self.run_ast_nodes(code_ast.body, cell_name, interactivity) if store_history: # Write output to the database. Does nothing unless # history output logging is enabled. self.history_manager.store_output(self.execution_count) # Each cell is a *single* input, regardless of how many lines it has self.execution_count += 1 def run_ast_nodes(self, nodelist, cell_name, interactivity='last'): """Run a sequence of AST nodes. The execution mode depends on the interactivity parameter. Parameters ---------- nodelist : list A sequence of AST nodes to run. cell_name : str Will be passed to the compiler as the filename of the cell. Typically the value returned by ip.compile.cache(cell). interactivity : str 'all', 'last' or 'none', specifying which nodes should be run interactively (displaying output from expressions). Other values for this parameter will raise a ValueError. """ if not nodelist: return if interactivity == 'none': to_run_exec, to_run_interactive = nodelist, [] elif interactivity == 'last': to_run_exec, to_run_interactive = nodelist[:-1], nodelist[-1:] elif interactivity == 'all': to_run_exec, to_run_interactive = [], nodelist else: raise ValueError("Interactivity was %r" % interactivity) exec_count = self.execution_count if to_run_exec: mod = ast.Module(to_run_exec) self.code_to_run = code = self.compile(mod, cell_name, "exec") if self.run_code(code) == 1: return if to_run_interactive: mod = ast.Interactive(to_run_interactive) self.code_to_run = code = self.compile(mod, cell_name, "single") return self.run_code(code) # PENDING REMOVAL: this method is slated for deletion, once our new # input logic has been 100% moved to frontends and is stable. def runlines(self, lines, clean=False): """Run a string of one or more lines of source. This method is capable of running a string containing multiple source lines, as if they had been entered at the IPython prompt. Since it exposes IPython's processing machinery, the given strings can contain magic calls (%magic), special shell access (!cmd), etc. """ if not isinstance(lines, (list, tuple)): lines = lines.splitlines() if clean: lines = self._cleanup_ipy_script(lines) # We must start with a clean buffer, in case this is run from an # interactive IPython session (via a magic, for example). self.reset_buffer() # Since we will prefilter all lines, store the user's raw input too # before we apply any transformations self.buffer_raw[:] = [ l+'\n' for l in lines] more = False prefilter_lines = self.prefilter_manager.prefilter_lines with nested(self.builtin_trap, self.display_trap): for line in lines: # skip blank lines so we don't mess up the prompt counter, but # do NOT skip even a blank line if we are in a code block (more # is true) if line or more: more = self.push_line(prefilter_lines(line, more)) # IPython's run_source returns None if there was an error # compiling the code. This allows us to stop processing # right away, so the user gets the error message at the # right place. if more is None: break # final newline in case the input didn't have it, so that the code # actually does get executed if more: self.push_line('\n') def run_source(self, source, filename=None, symbol='single', post_execute=True): """Compile and run some source in the interpreter. Arguments are as for compile_command(). One several things can happen: 1) The input is incorrect; compile_command() raised an exception (SyntaxError or OverflowError). A syntax traceback will be printed by calling the showsyntaxerror() method. 2) The input is incomplete, and more input is required; compile_command() returned None. Nothing happens. 3) The input is complete; compile_command() returned a code object. The code is executed by calling self.run_code() (which also handles run-time exceptions, except for SystemExit). The return value is: - True in case 2 - False in the other cases, unless an exception is raised, where None is returned instead. This can be used by external callers to know whether to continue feeding input or not. The return value can be used to decide whether to use sys.ps1 or sys.ps2 to prompt the next line.""" # We need to ensure that the source is unicode from here on. if type(source)==str: usource = source.decode(self.stdin_encoding) else: usource = source if False: # dbg print 'Source:', repr(source) # dbg print 'USource:', repr(usource) # dbg print 'type:', type(source) # dbg print 'encoding', self.stdin_encoding # dbg try: code_name = self.compile.cache(usource, self.execution_count) code = self.compile(usource, code_name, symbol) except (OverflowError, SyntaxError, ValueError, TypeError, MemoryError): # Case 1 self.showsyntaxerror(filename) return None if code is None: # Case 2 return True # Case 3 # We store the code object so that threaded shells and # custom exception handlers can access all this info if needed. # The source corresponding to this can be obtained from the # buffer attribute as '\n'.join(self.buffer). self.code_to_run = code # now actually execute the code object if self.run_code(code, post_execute) == 0: return False else: return None # For backwards compatibility runsource = run_source def run_code(self, code_obj, post_execute=True): """Execute a code object. When an exception occurs, self.showtraceback() is called to display a traceback. Return value: a flag indicating whether the code to be run completed successfully: - 0: successful execution. - 1: an error occurred. """ # Set our own excepthook in case the user code tries to call it # directly, so that the IPython crash handler doesn't get triggered old_excepthook,sys.excepthook = sys.excepthook, self.excepthook # we save the original sys.excepthook in the instance, in case config # code (such as magics) needs access to it. self.sys_excepthook = old_excepthook outflag = 1 # happens in more places, so it's easier as default try: try: self.hooks.pre_run_code_hook() #rprint('Running code', repr(code_obj)) # dbg exec code_obj in self.user_global_ns, self.user_ns finally: # Reset our crash handler in place sys.excepthook = old_excepthook except SystemExit: self.reset_buffer() self.showtraceback(exception_only=True) warn("To exit: use any of 'exit', 'quit', %Exit or Ctrl-D.", level=1) except self.custom_exceptions: etype,value,tb = sys.exc_info() self.CustomTB(etype,value,tb) except: self.showtraceback() else: outflag = 0 if softspace(sys.stdout, 0): print # Execute any registered post-execution functions. Here, any errors # are reported only minimally and just on the terminal, because the # main exception channel may be occupied with a user traceback. # FIXME: we need to think this mechanism a little more carefully. if post_execute: for func in self._post_execute: try: func() except: head = '[ ERROR ] Evaluating post_execute function: %s' % \ func print >> io.Term.cout, head print >> io.Term.cout, self._simple_error() print >> io.Term.cout, 'Removing from post_execute' self._post_execute.remove(func) # Flush out code object which has been run (and source) self.code_to_run = None return outflag # For backwards compatibility runcode = run_code # PENDING REMOVAL: this method is slated for deletion, once our new # input logic has been 100% moved to frontends and is stable. def push_line(self, line): """Push a line to the interpreter. The line should not have a trailing newline; it may have internal newlines. The line is appended to a buffer and the interpreter's run_source() method is called with the concatenated contents of the buffer as source. If this indicates that the command was executed or invalid, the buffer is reset; otherwise, the command is incomplete, and the buffer is left as it was after the line was appended. The return value is 1 if more input is required, 0 if the line was dealt with in some way (this is the same as run_source()). """ # autoindent management should be done here, and not in the # interactive loop, since that one is only seen by keyboard input. We # need this done correctly even for code run via runlines (which uses # push). #print 'push line: <%s>' % line # dbg self.buffer.append(line) full_source = '\n'.join(self.buffer) more = self.run_source(full_source, self.filename) if not more: self.history_manager.store_inputs(self.execution_count, '\n'.join(self.buffer_raw), full_source) self.reset_buffer() self.execution_count += 1 return more def reset_buffer(self): """Reset the input buffer.""" self.buffer[:] = [] self.buffer_raw[:] = [] self.input_splitter.reset() # For backwards compatibility resetbuffer = reset_buffer def _is_secondary_block_start(self, s): if not s.endswith(':'): return False if (s.startswith('elif') or s.startswith('else') or s.startswith('except') or s.startswith('finally')): return True def _cleanup_ipy_script(self, script): """Make a script safe for self.runlines() Currently, IPython is lines based, with blocks being detected by empty lines. This is a problem for block based scripts that may not have empty lines after blocks. This script adds those empty lines to make scripts safe for running in the current line based IPython. """ res = [] lines = script.splitlines() level = 0 for l in lines: lstripped = l.lstrip() stripped = l.strip() if not stripped: continue newlevel = len(l) - len(lstripped) if level > 0 and newlevel == 0 and \ not self._is_secondary_block_start(stripped): # add empty line res.append('') res.append(l) level = newlevel return '\n'.join(res) + '\n' #------------------------------------------------------------------------- # Things related to GUI support and pylab #------------------------------------------------------------------------- def enable_pylab(self, gui=None): raise NotImplementedError('Implement enable_pylab in a subclass') #------------------------------------------------------------------------- # Utilities #------------------------------------------------------------------------- def var_expand(self,cmd,depth=0): """Expand python variables in a string. The depth argument indicates how many frames above the caller should be walked to look for the local namespace where to expand variables. The global namespace for expansion is always the user's interactive namespace. """ res = ItplNS(cmd, self.user_ns, # globals # Skip our own frame in searching for locals: sys._getframe(depth+1).f_locals # locals ) return str(res).decode(res.codec) def mktempfile(self, data=None, prefix='ipython_edit_'): """Make a new tempfile and return its filename. This makes a call to tempfile.mktemp, but it registers the created filename internally so ipython cleans it up at exit time. Optional inputs: - data(None): if data is given, it gets written out to the temp file immediately, and the file is closed again.""" filename = tempfile.mktemp('.py', prefix) self.tempfiles.append(filename) if data: tmp_file = open(filename,'w') tmp_file.write(data) tmp_file.close() return filename # TODO: This should be removed when Term is refactored. def write(self,data): """Write a string to the default output""" io.Term.cout.write(data) # TODO: This should be removed when Term is refactored. def write_err(self,data): """Write a string to the default error output""" io.Term.cerr.write(data) def ask_yes_no(self,prompt,default=True): if self.quiet: return True return ask_yes_no(prompt,default) def show_usage(self): """Show a usage message""" page.page(IPython.core.usage.interactive_usage) def find_user_code(self, target, raw=True): """Get a code string from history, file, or a string or macro. This is mainly used by magic functions. Parameters ---------- target : str A string specifying code to retrieve. This will be tried respectively as: ranges of input history (see %history for syntax), a filename, or an expression evaluating to a string or Macro in the user namespace. raw : bool If true (default), retrieve raw history. Has no effect on the other retrieval mechanisms. Returns ------- A string of code. ValueError is raised if nothing is found, and TypeError if it evaluates to an object of another type. In each case, .args[0] is a printable message. """ code = self.extract_input_lines(target, raw=raw) # Grab history if code: return code if os.path.isfile(target): # Read file return open(target, "r").read() try: # User namespace codeobj = eval(target, self.user_ns) except Exception: raise ValueError(("'%s' was not found in history, as a file, nor in" " the user namespace.") % target) if isinstance(codeobj, basestring): return codeobj elif isinstance(codeobj, Macro): return codeobj.value raise TypeError("%s is neither a string nor a macro." % target, codeobj) #------------------------------------------------------------------------- # Things related to IPython exiting #------------------------------------------------------------------------- def atexit_operations(self): """This will be executed at the time of exit. Cleanup operations and saving of persistent data that is done unconditionally by IPython should be performed here. For things that may depend on startup flags or platform specifics (such as having readline or not), register a separate atexit function in the code that has the appropriate information, rather than trying to clutter """ # Cleanup all tempfiles left around for tfile in self.tempfiles: try: os.unlink(tfile) except OSError: pass # Close the history session (this stores the end time and line count) self.history_manager.end_session() # Clear all user namespaces to release all references cleanly. self.reset(new_session=False) # Run user hooks self.hooks.shutdown_hook() def cleanup(self): self.restore_sys_module_state() class InteractiveShellABC(object): """An abstract base class for InteractiveShell.""" __metaclass__ = abc.ABCMeta InteractiveShellABC.register(InteractiveShell)