##// END OF EJS Templates
Fully disable -twisted option (though the twshell code remains
Fully disable -twisted option (though the twshell code remains

File last commit:

r1215:1b7c474f
r1215:1b7c474f
Show More
Shell.py
1225 lines | 43.4 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
"""IPython Shell classes.
All the matplotlib support code was co-developed with John Hunter,
matplotlib's author.
$Id: Shell.py 3024 2008-02-07 15:34:42Z darren.dale $"""
#*****************************************************************************
# Copyright (C) 2001-2006 Fernando Perez <fperez@colorado.edu>
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#*****************************************************************************
from IPython import Release
__author__ = '%s <%s>' % Release.authors['Fernando']
__license__ = Release.license
# Code begins
# Stdlib imports
import __builtin__
import __main__
import Queue
import inspect
import os
import sys
import thread
import threading
import time
from signal import signal, SIGINT
try:
import ctypes
HAS_CTYPES = True
except ImportError:
HAS_CTYPES = False
# IPython imports
import IPython
from IPython import ultraTB, ipapi
from IPython.genutils import Term,warn,error,flag_calls, ask_yes_no
from IPython.iplib import InteractiveShell
from IPython.ipmaker import make_IPython
from IPython.Magic import Magic
from IPython.ipstruct import Struct
try: # Python 2.3 compatibility
set
except NameError:
import sets
set = sets.Set
# Globals
# global flag to pass around information about Ctrl-C without exceptions
KBINT = False
# global flag to turn on/off Tk support.
USE_TK = False
# ID for the main thread, used for cross-thread exceptions
MAIN_THREAD_ID = thread.get_ident()
# Tag when runcode() is active, for exception handling
CODE_RUN = None
#-----------------------------------------------------------------------------
# This class is trivial now, but I want to have it in to publish a clean
# interface. Later when the internals are reorganized, code that uses this
# shouldn't have to change.
class IPShell:
"""Create an IPython instance."""
def __init__(self,argv=None,user_ns=None,user_global_ns=None,
debug=1,shell_class=InteractiveShell):
self.IP = make_IPython(argv,user_ns=user_ns,
user_global_ns=user_global_ns,
debug=debug,shell_class=shell_class)
def mainloop(self,sys_exit=0,banner=None):
self.IP.mainloop(banner)
if sys_exit:
sys.exit()
#-----------------------------------------------------------------------------
def kill_embedded(self,parameter_s=''):
"""%kill_embedded : deactivate for good the current embedded IPython.
This function (after asking for confirmation) sets an internal flag so that
an embedded IPython will never activate again. This is useful to
permanently disable a shell that is being called inside a loop: once you've
figured out what you needed from it, you may then kill it and the program
will then continue to run without the interactive shell interfering again.
"""
kill = ask_yes_no("Are you sure you want to kill this embedded instance "
"(y/n)? [y/N] ",'n')
if kill:
self.shell.embedded_active = False
print "This embedded IPython will not reactivate anymore once you exit."
class IPShellEmbed:
"""Allow embedding an IPython shell into a running program.
Instances of this class are callable, with the __call__ method being an
alias to the embed() method of an InteractiveShell instance.
Usage (see also the example-embed.py file for a running example):
ipshell = IPShellEmbed([argv,banner,exit_msg,rc_override])
- argv: list containing valid command-line options for IPython, as they
would appear in sys.argv[1:].
For example, the following command-line options:
$ ipython -prompt_in1 'Input <\\#>' -colors LightBG
would be passed in the argv list as:
['-prompt_in1','Input <\\#>','-colors','LightBG']
- banner: string which gets printed every time the interpreter starts.
- exit_msg: string which gets printed every time the interpreter exits.
- rc_override: a dict or Struct of configuration options such as those
used by IPython. These options are read from your ~/.ipython/ipythonrc
file when the Shell object is created. Passing an explicit rc_override
dict with any options you want allows you to override those values at
creation time without having to modify the file. This way you can create
embeddable instances configured in any way you want without editing any
global files (thus keeping your interactive IPython configuration
unchanged).
Then the ipshell instance can be called anywhere inside your code:
ipshell(header='') -> Opens up an IPython shell.
- header: string printed by the IPython shell upon startup. This can let
you know where in your code you are when dropping into the shell. Note
that 'banner' gets prepended to all calls, so header is used for
location-specific information.
For more details, see the __call__ method below.
When the IPython shell is exited with Ctrl-D, normal program execution
resumes.
This functionality was inspired by a posting on comp.lang.python by cmkl
<cmkleffner@gmx.de> on Dec. 06/01 concerning similar uses of pyrepl, and
by the IDL stop/continue commands."""
def __init__(self,argv=None,banner='',exit_msg=None,rc_override=None,
user_ns=None):
"""Note that argv here is a string, NOT a list."""
self.set_banner(banner)
self.set_exit_msg(exit_msg)
self.set_dummy_mode(0)
# sys.displayhook is a global, we need to save the user's original
# Don't rely on __displayhook__, as the user may have changed that.
self.sys_displayhook_ori = sys.displayhook
# save readline completer status
try:
#print 'Save completer',sys.ipcompleter # dbg
self.sys_ipcompleter_ori = sys.ipcompleter
except:
pass # not nested with IPython
self.IP = make_IPython(argv,rc_override=rc_override,
embedded=True,
user_ns=user_ns)
ip = ipapi.IPApi(self.IP)
ip.expose_magic("kill_embedded",kill_embedded)
# copy our own displayhook also
self.sys_displayhook_embed = sys.displayhook
# and leave the system's display hook clean
sys.displayhook = self.sys_displayhook_ori
# don't use the ipython crash handler so that user exceptions aren't
# trapped
sys.excepthook = ultraTB.FormattedTB(color_scheme = self.IP.rc.colors,
mode = self.IP.rc.xmode,
call_pdb = self.IP.rc.pdb)
self.restore_system_completer()
def restore_system_completer(self):
"""Restores the readline completer which was in place.
This allows embedded IPython within IPython not to disrupt the
parent's completion.
"""
try:
self.IP.readline.set_completer(self.sys_ipcompleter_ori)
sys.ipcompleter = self.sys_ipcompleter_ori
except:
pass
def __call__(self,header='',local_ns=None,global_ns=None,dummy=None):
"""Activate the interactive interpreter.
__call__(self,header='',local_ns=None,global_ns,dummy=None) -> Start
the interpreter shell with the given local and global namespaces, and
optionally print a header string at startup.
The shell can be globally activated/deactivated using the
set/get_dummy_mode methods. This allows you to turn off a shell used
for debugging globally.
However, *each* time you call the shell you can override the current
state of dummy_mode with the optional keyword parameter 'dummy'. For
example, if you set dummy mode on with IPShell.set_dummy_mode(1), you
can still have a specific call work by making it as IPShell(dummy=0).
The optional keyword parameter dummy controls whether the call
actually does anything. """
# If the user has turned it off, go away
if not self.IP.embedded_active:
return
# Normal exits from interactive mode set this flag, so the shell can't
# re-enter (it checks this variable at the start of interactive mode).
self.IP.exit_now = False
# Allow the dummy parameter to override the global __dummy_mode
if dummy or (dummy != 0 and self.__dummy_mode):
return
# Set global subsystems (display,completions) to our values
sys.displayhook = self.sys_displayhook_embed
if self.IP.has_readline:
self.IP.set_completer()
if self.banner and header:
format = '%s\n%s\n'
else:
format = '%s%s\n'
banner = format % (self.banner,header)
# Call the embedding code with a stack depth of 1 so it can skip over
# our call and get the original caller's namespaces.
self.IP.embed_mainloop(banner,local_ns,global_ns,stack_depth=1)
if self.exit_msg:
print self.exit_msg
# Restore global systems (display, completion)
sys.displayhook = self.sys_displayhook_ori
self.restore_system_completer()
def set_dummy_mode(self,dummy):
"""Sets the embeddable shell's dummy mode parameter.
set_dummy_mode(dummy): dummy = 0 or 1.
This parameter is persistent and makes calls to the embeddable shell
silently return without performing any action. This allows you to
globally activate or deactivate a shell you're using with a single call.
If you need to manually"""
if dummy not in [0,1,False,True]:
raise ValueError,'dummy parameter must be boolean'
self.__dummy_mode = dummy
def get_dummy_mode(self):
"""Return the current value of the dummy mode parameter.
"""
return self.__dummy_mode
def set_banner(self,banner):
"""Sets the global banner.
This banner gets prepended to every header printed when the shell
instance is called."""
self.banner = banner
def set_exit_msg(self,exit_msg):
"""Sets the global exit_msg.
This exit message gets printed upon exiting every time the embedded
shell is called. It is None by default. """
self.exit_msg = exit_msg
#-----------------------------------------------------------------------------
if HAS_CTYPES:
# Add async exception support. Trick taken from:
# http://sebulba.wikispaces.com/recipe+thread2
def _async_raise(tid, exctype):
"""raises the exception, performs cleanup if needed"""
if not inspect.isclass(exctype):
raise TypeError("Only types can be raised (not instances)")
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(tid,
ctypes.py_object(exctype))
if res == 0:
raise ValueError("invalid thread id")
elif res != 1:
# """if it returns a number greater than one, you're in trouble,
# and you should call it again with exc=NULL to revert the effect"""
ctypes.pythonapi.PyThreadState_SetAsyncExc(tid, 0)
raise SystemError("PyThreadState_SetAsyncExc failed")
def sigint_handler (signum,stack_frame):
"""Sigint handler for threaded apps.
This is a horrible hack to pass information about SIGINT _without_
using exceptions, since I haven't been able to properly manage
cross-thread exceptions in GTK/WX. In fact, I don't think it can be
done (or at least that's my understanding from a c.l.py thread where
this was discussed)."""
global KBINT
if CODE_RUN:
_async_raise(MAIN_THREAD_ID,KeyboardInterrupt)
else:
KBINT = True
print '\nKeyboardInterrupt - Press <Enter> to continue.',
Term.cout.flush()
else:
def sigint_handler (signum,stack_frame):
"""Sigint handler for threaded apps.
This is a horrible hack to pass information about SIGINT _without_
using exceptions, since I haven't been able to properly manage
cross-thread exceptions in GTK/WX. In fact, I don't think it can be
done (or at least that's my understanding from a c.l.py thread where
this was discussed)."""
global KBINT
print '\nKeyboardInterrupt - Press <Enter> to continue.',
Term.cout.flush()
# Set global flag so that runsource can know that Ctrl-C was hit
KBINT = True
class MTInteractiveShell(InteractiveShell):
"""Simple multi-threaded shell."""
# Threading strategy taken from:
# http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65109, by Brian
# McErlean and John Finlay. Modified with corrections by Antoon Pardon,
# from the pygtk mailing list, to avoid lockups with system calls.
# class attribute to indicate whether the class supports threads or not.
# Subclasses with thread support should override this as needed.
isthreaded = True
def __init__(self,name,usage=None,rc=Struct(opts=None,args=None),
user_ns=None,user_global_ns=None,banner2='',**kw):
"""Similar to the normal InteractiveShell, but with threading control"""
InteractiveShell.__init__(self,name,usage,rc,user_ns,
user_global_ns,banner2)
# A queue to hold the code to be executed.
self.code_queue = Queue.Queue()
# Stuff to do at closing time
self._kill = None
on_kill = kw.get('on_kill', [])
# Check that all things to kill are callable:
for t in on_kill:
if not callable(t):
raise TypeError,'on_kill must be a list of callables'
self.on_kill = on_kill
# thread identity of the "worker thread" (that may execute code directly)
self.worker_ident = None
def runsource(self, source, filename="<input>", symbol="single"):
"""Compile and run some source in the interpreter.
Modified version of code.py's runsource(), to handle threading issues.
See the original for full docstring details."""
global KBINT
# If Ctrl-C was typed, we reset the flag and return right away
if KBINT:
KBINT = False
return False
if self._kill:
# can't queue new code if we are being killed
return True
try:
code = self.compile(source, filename, symbol)
except (OverflowError, SyntaxError, ValueError):
# Case 1
self.showsyntaxerror(filename)
return False
if code is None:
# Case 2
return True
# shortcut - if we are in worker thread, or the worker thread is not running,
# execute directly (to allow recursion and prevent deadlock if code is run early
# in IPython construction)
if (self.worker_ident is None or self.worker_ident == thread.get_ident()):
InteractiveShell.runcode(self,code)
return
# Case 3
# Store code in queue, so the execution thread can handle it.
completed_ev, received_ev = threading.Event(), threading.Event()
self.code_queue.put((code,completed_ev, received_ev))
# first make sure the message was received, with timeout
received_ev.wait(5)
if not received_ev.isSet():
# the mainloop is dead, start executing code directly
print "Warning: Timeout for mainloop thread exceeded"
print "switching to nonthreaded mode (until mainloop wakes up again)"
self.worker_ident = None
else:
completed_ev.wait()
return False
def runcode(self):
"""Execute a code object.
Multithreaded wrapper around IPython's runcode()."""
global CODE_RUN
# we are in worker thread, stash out the id for runsource()
self.worker_ident = thread.get_ident()
if self._kill:
print >>Term.cout, 'Closing threads...',
Term.cout.flush()
for tokill in self.on_kill:
tokill()
print >>Term.cout, 'Done.'
# allow kill() to return
self._kill.set()
return True
# Install sigint handler. We do it every time to ensure that if user
# code modifies it, we restore our own handling.
try:
signal(SIGINT,sigint_handler)
except SystemError:
# This happens under Windows, which seems to have all sorts
# of problems with signal handling. Oh well...
pass
# Flush queue of pending code by calling the run methood of the parent
# class with all items which may be in the queue.
code_to_run = None
while 1:
try:
code_to_run, completed_ev, received_ev = self.code_queue.get_nowait()
except Queue.Empty:
break
received_ev.set()
# Exceptions need to be raised differently depending on which
# thread is active. This convoluted try/except is only there to
# protect against asynchronous exceptions, to ensure that a KBINT
# at the wrong time doesn't deadlock everything. The global
# CODE_TO_RUN is set to true/false as close as possible to the
# runcode() call, so that the KBINT handler is correctly informed.
try:
try:
CODE_RUN = True
InteractiveShell.runcode(self,code_to_run)
except KeyboardInterrupt:
print "Keyboard interrupted in mainloop"
while not self.code_queue.empty():
code, ev1,ev2 = self.code_queue.get_nowait()
ev1.set()
ev2.set()
break
finally:
CODE_RUN = False
# allow runsource() return from wait
completed_ev.set()
# This MUST return true for gtk threading to work
return True
def kill(self):
"""Kill the thread, returning when it has been shut down."""
self._kill = threading.Event()
self._kill.wait()
class MatplotlibShellBase:
"""Mixin class to provide the necessary modifications to regular IPython
shell classes for matplotlib support.
Given Python's MRO, this should be used as the FIRST class in the
inheritance hierarchy, so that it overrides the relevant methods."""
def _matplotlib_config(self,name,user_ns):
"""Return items needed to setup the user's shell with matplotlib"""
# Initialize matplotlib to interactive mode always
import matplotlib
from matplotlib import backends
matplotlib.interactive(True)
def use(arg):
"""IPython wrapper for matplotlib's backend switcher.
In interactive use, we can not allow switching to a different
interactive backend, since thread conflicts will most likely crash
the python interpreter. This routine does a safety check first,
and refuses to perform a dangerous switch. It still allows
switching to non-interactive backends."""
if arg in backends.interactive_bk and arg != self.mpl_backend:
m=('invalid matplotlib backend switch.\n'
'This script attempted to switch to the interactive '
'backend: `%s`\n'
'Your current choice of interactive backend is: `%s`\n\n'
'Switching interactive matplotlib backends at runtime\n'
'would crash the python interpreter, '
'and IPython has blocked it.\n\n'
'You need to either change your choice of matplotlib backend\n'
'by editing your .matplotlibrc file, or run this script as a \n'
'standalone file from the command line, not using IPython.\n' %
(arg,self.mpl_backend) )
raise RuntimeError, m
else:
self.mpl_use(arg)
self.mpl_use._called = True
self.matplotlib = matplotlib
self.mpl_backend = matplotlib.rcParams['backend']
# we also need to block switching of interactive backends by use()
self.mpl_use = matplotlib.use
self.mpl_use._called = False
# overwrite the original matplotlib.use with our wrapper
matplotlib.use = use
# This must be imported last in the matplotlib series, after
# backend/interactivity choices have been made
import matplotlib.pylab as pylab
self.pylab = pylab
self.pylab.show._needmain = False
# We need to detect at runtime whether show() is called by the user.
# For this, we wrap it into a decorator which adds a 'called' flag.
self.pylab.draw_if_interactive = flag_calls(self.pylab.draw_if_interactive)
# Build a user namespace initialized with matplotlib/matlab features.
user_ns = IPython.ipapi.make_user_ns(user_ns)
exec ("import matplotlib\n"
"import matplotlib.pylab as pylab\n") in user_ns
# Build matplotlib info banner
b="""
Welcome to pylab, a matplotlib-based Python environment.
For more information, type 'help(pylab)'.
"""
return user_ns,b
def mplot_exec(self,fname,*where,**kw):
"""Execute a matplotlib script.
This is a call to execfile(), but wrapped in safeties to properly
handle interactive rendering and backend switching."""
#print '*** Matplotlib runner ***' # dbg
# turn off rendering until end of script
isInteractive = self.matplotlib.rcParams['interactive']
self.matplotlib.interactive(False)
self.safe_execfile(fname,*where,**kw)
self.matplotlib.interactive(isInteractive)
# make rendering call now, if the user tried to do it
if self.pylab.draw_if_interactive.called:
self.pylab.draw()
self.pylab.draw_if_interactive.called = False
# if a backend switch was performed, reverse it now
if self.mpl_use._called:
self.matplotlib.rcParams['backend'] = self.mpl_backend
def magic_run(self,parameter_s=''):
Magic.magic_run(self,parameter_s,runner=self.mplot_exec)
# Fix the docstring so users see the original as well
magic_run.__doc__ = "%s\n%s" % (Magic.magic_run.__doc__,
"\n *** Modified %run for Matplotlib,"
" with proper interactive handling ***")
# Now we provide 2 versions of a matplotlib-aware IPython base shells, single
# and multithreaded. Note that these are meant for internal use, the IPShell*
# classes below are the ones meant for public consumption.
class MatplotlibShell(MatplotlibShellBase,InteractiveShell):
"""Single-threaded shell with matplotlib support."""
def __init__(self,name,usage=None,rc=Struct(opts=None,args=None),
user_ns=None,user_global_ns=None,**kw):
user_ns,b2 = self._matplotlib_config(name,user_ns)
InteractiveShell.__init__(self,name,usage,rc,user_ns,user_global_ns,
banner2=b2,**kw)
class MatplotlibMTShell(MatplotlibShellBase,MTInteractiveShell):
"""Multi-threaded shell with matplotlib support."""
def __init__(self,name,usage=None,rc=Struct(opts=None,args=None),
user_ns=None,user_global_ns=None, **kw):
user_ns,b2 = self._matplotlib_config(name,user_ns)
MTInteractiveShell.__init__(self,name,usage,rc,user_ns,user_global_ns,
banner2=b2,**kw)
#-----------------------------------------------------------------------------
# Utility functions for the different GUI enabled IPShell* classes.
def get_tk():
"""Tries to import Tkinter and returns a withdrawn Tkinter root
window. If Tkinter is already imported or not available, this
returns None. This function calls `hijack_tk` underneath.
"""
if not USE_TK or sys.modules.has_key('Tkinter'):
return None
else:
try:
import Tkinter
except ImportError:
return None
else:
hijack_tk()
r = Tkinter.Tk()
r.withdraw()
return r
def hijack_tk():
"""Modifies Tkinter's mainloop with a dummy so when a module calls
mainloop, it does not block.
"""
def misc_mainloop(self, n=0):
pass
def tkinter_mainloop(n=0):
pass
import Tkinter
Tkinter.Misc.mainloop = misc_mainloop
Tkinter.mainloop = tkinter_mainloop
def update_tk(tk):
"""Updates the Tkinter event loop. This is typically called from
the respective WX or GTK mainloops.
"""
if tk:
tk.update()
def hijack_wx():
"""Modifies wxPython's MainLoop with a dummy so user code does not
block IPython. The hijacked mainloop function is returned.
"""
def dummy_mainloop(*args, **kw):
pass
try:
import wx
except ImportError:
# For very old versions of WX
import wxPython as wx
ver = wx.__version__
orig_mainloop = None
if ver[:3] >= '2.5':
import wx
if hasattr(wx, '_core_'): core = getattr(wx, '_core_')
elif hasattr(wx, '_core'): core = getattr(wx, '_core')
else: raise AttributeError('Could not find wx core module')
orig_mainloop = core.PyApp_MainLoop
core.PyApp_MainLoop = dummy_mainloop
elif ver[:3] == '2.4':
orig_mainloop = wx.wxc.wxPyApp_MainLoop
wx.wxc.wxPyApp_MainLoop = dummy_mainloop
else:
warn("Unable to find either wxPython version 2.4 or >= 2.5.")
return orig_mainloop
def hijack_gtk():
"""Modifies pyGTK's mainloop with a dummy so user code does not
block IPython. This function returns the original `gtk.mainloop`
function that has been hijacked.
"""
def dummy_mainloop(*args, **kw):
pass
import gtk
if gtk.pygtk_version >= (2,4,0): orig_mainloop = gtk.main
else: orig_mainloop = gtk.mainloop
gtk.mainloop = dummy_mainloop
gtk.main = dummy_mainloop
return orig_mainloop
def hijack_qt():
"""Modifies PyQt's mainloop with a dummy so user code does not
block IPython. This function returns the original
`qt.qApp.exec_loop` function that has been hijacked.
"""
def dummy_mainloop(*args, **kw):
pass
import qt
orig_mainloop = qt.qApp.exec_loop
qt.qApp.exec_loop = dummy_mainloop
qt.QApplication.exec_loop = dummy_mainloop
return orig_mainloop
def hijack_qt4():
"""Modifies PyQt4's mainloop with a dummy so user code does not
block IPython. This function returns the original
`QtGui.qApp.exec_` function that has been hijacked.
"""
def dummy_mainloop(*args, **kw):
pass
from PyQt4 import QtGui, QtCore
orig_mainloop = QtGui.qApp.exec_
QtGui.qApp.exec_ = dummy_mainloop
QtGui.QApplication.exec_ = dummy_mainloop
QtCore.QCoreApplication.exec_ = dummy_mainloop
return orig_mainloop
#-----------------------------------------------------------------------------
# The IPShell* classes below are the ones meant to be run by external code as
# IPython instances. Note that unless a specific threading strategy is
# desired, the factory function start() below should be used instead (it
# selects the proper threaded class).
class IPThread(threading.Thread):
def run(self):
self.IP.mainloop(self._banner)
self.IP.kill()
class IPShellGTK(IPThread):
"""Run a gtk mainloop() in a separate thread.
Python commands can be passed to the thread where they will be executed.
This is implemented by periodically checking for passed code using a
GTK timeout callback."""
TIMEOUT = 100 # Millisecond interval between timeouts.
def __init__(self,argv=None,user_ns=None,user_global_ns=None,
debug=1,shell_class=MTInteractiveShell):
import gtk
self.gtk = gtk
self.gtk_mainloop = hijack_gtk()
# Allows us to use both Tk and GTK.
self.tk = get_tk()
if gtk.pygtk_version >= (2,4,0): mainquit = self.gtk.main_quit
else: mainquit = self.gtk.mainquit
self.IP = make_IPython(argv,user_ns=user_ns,
user_global_ns=user_global_ns,
debug=debug,
shell_class=shell_class,
on_kill=[mainquit])
# HACK: slot for banner in self; it will be passed to the mainloop
# method only and .run() needs it. The actual value will be set by
# .mainloop().
self._banner = None
threading.Thread.__init__(self)
def mainloop(self,sys_exit=0,banner=None):
self._banner = banner
if self.gtk.pygtk_version >= (2,4,0):
import gobject
gobject.idle_add(self.on_timer)
else:
self.gtk.idle_add(self.on_timer)
if sys.platform != 'win32':
try:
if self.gtk.gtk_version[0] >= 2:
self.gtk.gdk.threads_init()
except AttributeError:
pass
except RuntimeError:
error('Your pyGTK likely has not been compiled with '
'threading support.\n'
'The exception printout is below.\n'
'You can either rebuild pyGTK with threads, or '
'try using \n'
'matplotlib with a different backend (like Tk or WX).\n'
'Note that matplotlib will most likely not work in its '
'current state!')
self.IP.InteractiveTB()
self.start()
self.gtk.gdk.threads_enter()
self.gtk_mainloop()
self.gtk.gdk.threads_leave()
self.join()
def on_timer(self):
"""Called when GTK is idle.
Must return True always, otherwise GTK stops calling it"""
update_tk(self.tk)
self.IP.runcode()
time.sleep(0.01)
return True
class IPShellWX(IPThread):
"""Run a wx mainloop() in a separate thread.
Python commands can be passed to the thread where they will be executed.
This is implemented by periodically checking for passed code using a
GTK timeout callback."""
TIMEOUT = 100 # Millisecond interval between timeouts.
def __init__(self,argv=None,user_ns=None,user_global_ns=None,
debug=1,shell_class=MTInteractiveShell):
self.IP = make_IPython(argv,user_ns=user_ns,
user_global_ns=user_global_ns,
debug=debug,
shell_class=shell_class,
on_kill=[self.wxexit])
wantedwxversion=self.IP.rc.wxversion
if wantedwxversion!="0":
try:
import wxversion
except ImportError:
error('The wxversion module is needed for WX version selection')
else:
try:
wxversion.select(wantedwxversion)
except:
self.IP.InteractiveTB()
error('Requested wxPython version %s could not be loaded' %
wantedwxversion)
import wx
threading.Thread.__init__(self)
self.wx = wx
self.wx_mainloop = hijack_wx()
# Allows us to use both Tk and GTK.
self.tk = get_tk()
# HACK: slot for banner in self; it will be passed to the mainloop
# method only and .run() needs it. The actual value will be set by
# .mainloop().
self._banner = None
self.app = None
def wxexit(self, *args):
if self.app is not None:
self.app.agent.timer.Stop()
self.app.ExitMainLoop()
def mainloop(self,sys_exit=0,banner=None):
self._banner = banner
self.start()
class TimerAgent(self.wx.MiniFrame):
wx = self.wx
IP = self.IP
tk = self.tk
def __init__(self, parent, interval):
style = self.wx.DEFAULT_FRAME_STYLE | self.wx.TINY_CAPTION_HORIZ
self.wx.MiniFrame.__init__(self, parent, -1, ' ', pos=(200, 200),
size=(100, 100),style=style)
self.Show(False)
self.interval = interval
self.timerId = self.wx.NewId()
def StartWork(self):
self.timer = self.wx.Timer(self, self.timerId)
self.wx.EVT_TIMER(self, self.timerId, self.OnTimer)
self.timer.Start(self.interval)
def OnTimer(self, event):
update_tk(self.tk)
self.IP.runcode()
class App(self.wx.App):
wx = self.wx
TIMEOUT = self.TIMEOUT
def OnInit(self):
'Create the main window and insert the custom frame'
self.agent = TimerAgent(None, self.TIMEOUT)
self.agent.Show(False)
self.agent.StartWork()
return True
self.app = App(redirect=False)
self.wx_mainloop(self.app)
self.join()
class IPShellQt(IPThread):
"""Run a Qt event loop in a separate thread.
Python commands can be passed to the thread where they will be executed.
This is implemented by periodically checking for passed code using a
Qt timer / slot."""
TIMEOUT = 100 # Millisecond interval between timeouts.
def __init__(self, argv=None, user_ns=None, user_global_ns=None,
debug=0, shell_class=MTInteractiveShell):
import qt
self.exec_loop = hijack_qt()
# Allows us to use both Tk and QT.
self.tk = get_tk()
self.IP = make_IPython(argv,
user_ns=user_ns,
user_global_ns=user_global_ns,
debug=debug,
shell_class=shell_class,
on_kill=[qt.qApp.exit])
# HACK: slot for banner in self; it will be passed to the mainloop
# method only and .run() needs it. The actual value will be set by
# .mainloop().
self._banner = None
threading.Thread.__init__(self)
def mainloop(self, sys_exit=0, banner=None):
import qt
self._banner = banner
if qt.QApplication.startingUp():
a = qt.QApplication(sys.argv)
self.timer = qt.QTimer()
qt.QObject.connect(self.timer,
qt.SIGNAL('timeout()'),
self.on_timer)
self.start()
self.timer.start(self.TIMEOUT, True)
while True:
if self.IP._kill: break
self.exec_loop()
self.join()
def on_timer(self):
update_tk(self.tk)
result = self.IP.runcode()
self.timer.start(self.TIMEOUT, True)
return result
class IPShellQt4(IPThread):
"""Run a Qt event loop in a separate thread.
Python commands can be passed to the thread where they will be executed.
This is implemented by periodically checking for passed code using a
Qt timer / slot."""
TIMEOUT = 100 # Millisecond interval between timeouts.
def __init__(self, argv=None, user_ns=None, user_global_ns=None,
debug=0, shell_class=MTInteractiveShell):
from PyQt4 import QtCore, QtGui
try:
# present in PyQt4-4.2.1 or later
QtCore.pyqtRemoveInputHook()
except AttributeError:
pass
if QtCore.PYQT_VERSION_STR == '4.3':
warn('''PyQt4 version 4.3 detected.
If you experience repeated threading warnings, please update PyQt4.
''')
self.exec_ = hijack_qt4()
# Allows us to use both Tk and QT.
self.tk = get_tk()
self.IP = make_IPython(argv,
user_ns=user_ns,
user_global_ns=user_global_ns,
debug=debug,
shell_class=shell_class,
on_kill=[QtGui.qApp.exit])
# HACK: slot for banner in self; it will be passed to the mainloop
# method only and .run() needs it. The actual value will be set by
# .mainloop().
self._banner = None
threading.Thread.__init__(self)
def mainloop(self, sys_exit=0, banner=None):
from PyQt4 import QtCore, QtGui
self._banner = banner
if QtGui.QApplication.startingUp():
a = QtGui.QApplication(sys.argv)
self.timer = QtCore.QTimer()
QtCore.QObject.connect(self.timer,
QtCore.SIGNAL('timeout()'),
self.on_timer)
self.start()
self.timer.start(self.TIMEOUT)
while True:
if self.IP._kill: break
self.exec_()
self.join()
def on_timer(self):
update_tk(self.tk)
result = self.IP.runcode()
self.timer.start(self.TIMEOUT)
return result
# A set of matplotlib public IPython shell classes, for single-threaded (Tk*
# and FLTK*) and multithreaded (GTK*, WX* and Qt*) backends to use.
def _load_pylab(user_ns):
"""Allow users to disable pulling all of pylab into the top-level
namespace.
This little utility must be called AFTER the actual ipython instance is
running, since only then will the options file have been fully parsed."""
ip = IPython.ipapi.get()
if ip.options.pylab_import_all:
ip.ex("from matplotlib.pylab import *")
ip.IP.user_config_ns.update(ip.user_ns)
class IPShellMatplotlib(IPShell):
"""Subclass IPShell with MatplotlibShell as the internal shell.
Single-threaded class, meant for the Tk* and FLTK* backends.
Having this on a separate class simplifies the external driver code."""
def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1):
IPShell.__init__(self,argv,user_ns,user_global_ns,debug,
shell_class=MatplotlibShell)
_load_pylab(self.IP.user_ns)
class IPShellMatplotlibGTK(IPShellGTK):
"""Subclass IPShellGTK with MatplotlibMTShell as the internal shell.
Multi-threaded class, meant for the GTK* backends."""
def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1):
IPShellGTK.__init__(self,argv,user_ns,user_global_ns,debug,
shell_class=MatplotlibMTShell)
_load_pylab(self.IP.user_ns)
class IPShellMatplotlibWX(IPShellWX):
"""Subclass IPShellWX with MatplotlibMTShell as the internal shell.
Multi-threaded class, meant for the WX* backends."""
def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1):
IPShellWX.__init__(self,argv,user_ns,user_global_ns,debug,
shell_class=MatplotlibMTShell)
_load_pylab(self.IP.user_ns)
class IPShellMatplotlibQt(IPShellQt):
"""Subclass IPShellQt with MatplotlibMTShell as the internal shell.
Multi-threaded class, meant for the Qt* backends."""
def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1):
IPShellQt.__init__(self,argv,user_ns,user_global_ns,debug,
shell_class=MatplotlibMTShell)
_load_pylab(self.IP.user_ns)
class IPShellMatplotlibQt4(IPShellQt4):
"""Subclass IPShellQt4 with MatplotlibMTShell as the internal shell.
Multi-threaded class, meant for the Qt4* backends."""
def __init__(self,argv=None,user_ns=None,user_global_ns=None,debug=1):
IPShellQt4.__init__(self,argv,user_ns,user_global_ns,debug,
shell_class=MatplotlibMTShell)
_load_pylab(self.IP.user_ns)
#-----------------------------------------------------------------------------
# Factory functions to actually start the proper thread-aware shell
def _select_shell(argv):
"""Select a shell from the given argv vector.
This function implements the threading selection policy, allowing runtime
control of the threading mode, both for general users and for matplotlib.
Return:
Shell class to be instantiated for runtime operation.
"""
global USE_TK
mpl_shell = {'gthread' : IPShellMatplotlibGTK,
'wthread' : IPShellMatplotlibWX,
'qthread' : IPShellMatplotlibQt,
'q4thread' : IPShellMatplotlibQt4,
'tkthread' : IPShellMatplotlib, # Tk is built-in
}
th_shell = {'gthread' : IPShellGTK,
'wthread' : IPShellWX,
'qthread' : IPShellQt,
'q4thread' : IPShellQt4,
'tkthread' : IPShell, # Tk is built-in
}
backends = {'gthread' : 'GTKAgg',
'wthread' : 'WXAgg',
'qthread' : 'QtAgg',
'q4thread' :'Qt4Agg',
'tkthread' :'TkAgg',
}
all_opts = set(['tk','pylab','gthread','qthread','q4thread','wthread',
'tkthread'])
user_opts = set([s.replace('-','') for s in argv[:3]])
special_opts = user_opts & all_opts
if 'tk' in special_opts:
USE_TK = True
special_opts.remove('tk')
if 'pylab' in special_opts:
try:
import matplotlib
except ImportError:
error('matplotlib could NOT be imported! Starting normal IPython.')
return IPShell
special_opts.remove('pylab')
# If there's any option left, it means the user wants to force the
# threading backend, else it's auto-selected from the rc file
if special_opts:
th_mode = special_opts.pop()
matplotlib.rcParams['backend'] = backends[th_mode]
else:
backend = matplotlib.rcParams['backend']
if backend.startswith('GTK'):
th_mode = 'gthread'
elif backend.startswith('WX'):
th_mode = 'wthread'
elif backend.startswith('Qt4'):
th_mode = 'q4thread'
elif backend.startswith('Qt'):
th_mode = 'qthread'
else:
# Any other backend, use plain Tk
th_mode = 'tkthread'
return mpl_shell[th_mode]
else:
# No pylab requested, just plain threads
try:
th_mode = special_opts.pop()
except KeyError:
th_mode = 'tkthread'
return th_shell[th_mode]
# This is the one which should be called by external code.
def start(user_ns = None):
"""Return a running shell instance, dealing with threading options.
This is a factory function which will instantiate the proper IPython shell
based on the user's threading choice. Such a selector is needed because
different GUI toolkits require different thread handling details."""
shell = _select_shell(sys.argv)
return shell(user_ns = user_ns)
# Some aliases for backwards compatibility
IPythonShell = IPShell
IPythonShellEmbed = IPShellEmbed
#************************ End of file <Shell.py> ***************************