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# -*- coding: utf-8 -*-
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"""Tools for inspecting Python objects.
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Uses syntax highlighting for presenting the various information elements.
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Similar in spirit to the inspect module, but all calls take a name argument to
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reference the name under which an object is being read.
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"""
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#*****************************************************************************
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# Copyright (C) 2001-2004 Fernando Perez <fperez@colorado.edu>
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#*****************************************************************************
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__all__ = ['Inspector','InspectColors']
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# stdlib modules
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import __builtin__
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import StringIO
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import inspect
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import linecache
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import os
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import string
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import sys
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import types
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# IPython's own
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from IPython.core.page import page
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from IPython.external.Itpl import itpl
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from IPython.utils import PyColorize
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import IPython.utils.io
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from IPython.utils.text import indent
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from IPython.utils.wildcard import list_namespace
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from IPython.utils.coloransi import *
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#****************************************************************************
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# HACK!!! This is a crude fix for bugs in python 2.3's inspect module. We
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# simply monkeypatch inspect with code copied from python 2.4.
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if sys.version_info[:2] == (2,3):
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from inspect import ismodule, getabsfile, modulesbyfile
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def getmodule(object):
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"""Return the module an object was defined in, or None if not found."""
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if ismodule(object):
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return object
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if hasattr(object, '__module__'):
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return sys.modules.get(object.__module__)
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try:
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file = getabsfile(object)
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except TypeError:
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return None
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if file in modulesbyfile:
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return sys.modules.get(modulesbyfile[file])
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for module in sys.modules.values():
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if hasattr(module, '__file__'):
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modulesbyfile[
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os.path.realpath(
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getabsfile(module))] = module.__name__
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if file in modulesbyfile:
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return sys.modules.get(modulesbyfile[file])
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main = sys.modules['__main__']
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if not hasattr(object, '__name__'):
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return None
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if hasattr(main, object.__name__):
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mainobject = getattr(main, object.__name__)
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if mainobject is object:
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return main
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builtin = sys.modules['__builtin__']
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if hasattr(builtin, object.__name__):
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builtinobject = getattr(builtin, object.__name__)
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if builtinobject is object:
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return builtin
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inspect.getmodule = getmodule
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#****************************************************************************
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# Builtin color schemes
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Colors = TermColors # just a shorthand
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# Build a few color schemes
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NoColor = ColorScheme(
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'NoColor',{
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'header' : Colors.NoColor,
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'normal' : Colors.NoColor # color off (usu. Colors.Normal)
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} )
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LinuxColors = ColorScheme(
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'Linux',{
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'header' : Colors.LightRed,
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'normal' : Colors.Normal # color off (usu. Colors.Normal)
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} )
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LightBGColors = ColorScheme(
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'LightBG',{
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'header' : Colors.Red,
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'normal' : Colors.Normal # color off (usu. Colors.Normal)
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} )
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# Build table of color schemes (needed by the parser)
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InspectColors = ColorSchemeTable([NoColor,LinuxColors,LightBGColors],
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'Linux')
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#****************************************************************************
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# Auxiliary functions
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def getdoc(obj):
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"""Stable wrapper around inspect.getdoc.
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This can't crash because of attribute problems.
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It also attempts to call a getdoc() method on the given object. This
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allows objects which provide their docstrings via non-standard mechanisms
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(like Pyro proxies) to still be inspected by ipython's ? system."""
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ds = None # default return value
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try:
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ds = inspect.getdoc(obj)
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except:
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# Harden against an inspect failure, which can occur with
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# SWIG-wrapped extensions.
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pass
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# Allow objects to offer customized documentation via a getdoc method:
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try:
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ds2 = obj.getdoc()
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except:
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pass
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else:
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# if we get extra info, we add it to the normal docstring.
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if ds is None:
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ds = ds2
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else:
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ds = '%s\n%s' % (ds,ds2)
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return ds
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def getsource(obj,is_binary=False):
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"""Wrapper around inspect.getsource.
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This can be modified by other projects to provide customized source
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extraction.
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Inputs:
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- obj: an object whose source code we will attempt to extract.
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Optional inputs:
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- is_binary: whether the object is known to come from a binary source.
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This implementation will skip returning any output for binary objects, but
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custom extractors may know how to meaningfully process them."""
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if is_binary:
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return None
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else:
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try:
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src = inspect.getsource(obj)
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except TypeError:
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if hasattr(obj,'__class__'):
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src = inspect.getsource(obj.__class__)
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return src
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def getargspec(obj):
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"""Get the names and default values of a function's arguments.
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A tuple of four things is returned: (args, varargs, varkw, defaults).
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'args' is a list of the argument names (it may contain nested lists).
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'varargs' and 'varkw' are the names of the * and ** arguments or None.
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'defaults' is an n-tuple of the default values of the last n arguments.
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Modified version of inspect.getargspec from the Python Standard
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Library."""
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if inspect.isfunction(obj):
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func_obj = obj
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elif inspect.ismethod(obj):
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func_obj = obj.im_func
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else:
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raise TypeError, 'arg is not a Python function'
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args, varargs, varkw = inspect.getargs(func_obj.func_code)
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return args, varargs, varkw, func_obj.func_defaults
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#****************************************************************************
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# Class definitions
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class myStringIO(StringIO.StringIO):
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"""Adds a writeln method to normal StringIO."""
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def writeln(self,*arg,**kw):
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"""Does a write() and then a write('\n')"""
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self.write(*arg,**kw)
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self.write('\n')
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class Inspector:
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def __init__(self,color_table,code_color_table,scheme,
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str_detail_level=0):
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self.color_table = color_table
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self.parser = PyColorize.Parser(code_color_table,out='str')
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self.format = self.parser.format
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self.str_detail_level = str_detail_level
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self.set_active_scheme(scheme)
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def __getdef(self,obj,oname=''):
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"""Return the definition header for any callable object.
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If any exception is generated, None is returned instead and the
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exception is suppressed."""
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try:
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return oname + inspect.formatargspec(*getargspec(obj))
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except:
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return None
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def __head(self,h):
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"""Return a header string with proper colors."""
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return '%s%s%s' % (self.color_table.active_colors.header,h,
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self.color_table.active_colors.normal)
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def set_active_scheme(self,scheme):
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self.color_table.set_active_scheme(scheme)
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self.parser.color_table.set_active_scheme(scheme)
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def noinfo(self,msg,oname):
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"""Generic message when no information is found."""
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print 'No %s found' % msg,
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if oname:
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print 'for %s' % oname
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else:
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print
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def pdef(self,obj,oname=''):
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"""Print the definition header for any callable object.
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If the object is a class, print the constructor information."""
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if not callable(obj):
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print 'Object is not callable.'
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return
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header = ''
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if inspect.isclass(obj):
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header = self.__head('Class constructor information:\n')
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obj = obj.__init__
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elif type(obj) is types.InstanceType:
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obj = obj.__call__
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output = self.__getdef(obj,oname)
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if output is None:
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self.noinfo('definition header',oname)
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else:
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print >>IPython.utils.io.Term.cout, header,self.format(output),
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def pdoc(self,obj,oname='',formatter = None):
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"""Print the docstring for any object.
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Optional:
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-formatter: a function to run the docstring through for specially
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formatted docstrings."""
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head = self.__head # so that itpl can find it even if private
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ds = getdoc(obj)
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if formatter:
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ds = formatter(ds)
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if inspect.isclass(obj):
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init_ds = getdoc(obj.__init__)
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output = itpl('$head("Class Docstring:")\n'
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'$indent(ds)\n'
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'$head("Constructor Docstring"):\n'
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'$indent(init_ds)')
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elif (type(obj) is types.InstanceType or isinstance(obj,object)) \
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and hasattr(obj,'__call__'):
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call_ds = getdoc(obj.__call__)
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if call_ds:
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output = itpl('$head("Class Docstring:")\n$indent(ds)\n'
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'$head("Calling Docstring:")\n$indent(call_ds)')
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else:
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output = ds
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else:
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output = ds
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if output is None:
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self.noinfo('documentation',oname)
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return
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page(output)
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def psource(self,obj,oname=''):
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"""Print the source code for an object."""
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# Flush the source cache because inspect can return out-of-date source
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linecache.checkcache()
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try:
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src = getsource(obj)
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except:
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self.noinfo('source',oname)
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else:
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page(self.format(src))
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def pfile(self,obj,oname=''):
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"""Show the whole file where an object was defined."""
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try:
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try:
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lineno = inspect.getsourcelines(obj)[1]
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except TypeError:
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# For instances, try the class object like getsource() does
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if hasattr(obj,'__class__'):
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lineno = inspect.getsourcelines(obj.__class__)[1]
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# Adjust the inspected object so getabsfile() below works
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obj = obj.__class__
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except:
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self.noinfo('file',oname)
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return
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# We only reach this point if object was successfully queried
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# run contents of file through pager starting at line
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# where the object is defined
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ofile = inspect.getabsfile(obj)
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if (ofile.endswith('.so') or ofile.endswith('.dll')):
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print 'File %r is binary, not printing.' % ofile
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elif not os.path.isfile(ofile):
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print 'File %r does not exist, not printing.' % ofile
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else:
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# Print only text files, not extension binaries. Note that
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# getsourcelines returns lineno with 1-offset and page() uses
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# 0-offset, so we must adjust.
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page(self.format(open(ofile).read()),lineno-1)
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def pinfo(self,obj,oname='',formatter=None,info=None,detail_level=0):
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"""Show detailed information about an object.
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Optional arguments:
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- oname: name of the variable pointing to the object.
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- formatter: special formatter for docstrings (see pdoc)
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- info: a structure with some information fields which may have been
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precomputed already.
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- detail_level: if set to 1, more information is given.
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"""
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obj_type = type(obj)
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header = self.__head
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if info is None:
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ismagic = 0
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isalias = 0
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ospace = ''
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else:
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ismagic = info.ismagic
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isalias = info.isalias
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ospace = info.namespace
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# Get docstring, special-casing aliases:
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if isalias:
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if not callable(obj):
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try:
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ds = "Alias to the system command:\n %s" % obj[1]
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except:
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ds = "Alias: " + str(obj)
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else:
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ds = "Alias to " + str(obj)
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if obj.__doc__:
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ds += "\nDocstring:\n" + obj.__doc__
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else:
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ds = getdoc(obj)
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if ds is None:
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ds = '<no docstring>'
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if formatter is not None:
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ds = formatter(ds)
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# store output in a list which gets joined with \n at the end.
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out = myStringIO()
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string_max = 200 # max size of strings to show (snipped if longer)
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shalf = int((string_max -5)/2)
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if ismagic:
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obj_type_name = 'Magic function'
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elif isalias:
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obj_type_name = 'System alias'
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else:
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obj_type_name = obj_type.__name__
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out.writeln(header('Type:\t\t')+obj_type_name)
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try:
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bclass = obj.__class__
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out.writeln(header('Base Class:\t')+str(bclass))
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except: pass
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# String form, but snip if too long in ? form (full in ??)
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if detail_level >= self.str_detail_level:
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try:
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ostr = str(obj)
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str_head = 'String Form:'
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if not detail_level and len(ostr)>string_max:
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ostr = ostr[:shalf] + ' <...> ' + ostr[-shalf:]
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ostr = ("\n" + " " * len(str_head.expandtabs())).\
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join(map(string.strip,ostr.split("\n")))
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if ostr.find('\n') > -1:
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# Print multi-line strings starting at the next line.
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str_sep = '\n'
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else:
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str_sep = '\t'
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out.writeln("%s%s%s" % (header(str_head),str_sep,ostr))
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except:
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pass
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if ospace:
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out.writeln(header('Namespace:\t')+ospace)
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# Length (for strings and lists)
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try:
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length = str(len(obj))
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out.writeln(header('Length:\t\t')+length)
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except: pass
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# Filename where object was defined
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binary_file = False
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try:
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try:
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fname = inspect.getabsfile(obj)
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except TypeError:
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# For an instance, the file that matters is where its class was
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# declared.
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if hasattr(obj,'__class__'):
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fname = inspect.getabsfile(obj.__class__)
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if fname.endswith('<string>'):
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fname = 'Dynamically generated function. No source code available.'
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if (fname.endswith('.so') or fname.endswith('.dll')):
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binary_file = True
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out.writeln(header('File:\t\t')+fname)
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except:
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# if anything goes wrong, we don't want to show source, so it's as
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# if the file was binary
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binary_file = True
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# reconstruct the function definition and print it:
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defln = self.__getdef(obj,oname)
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if defln:
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out.write(header('Definition:\t')+self.format(defln))
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# Docstrings only in detail 0 mode, since source contains them (we
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# avoid repetitions). If source fails, we add them back, see below.
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|
if ds and detail_level == 0:
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out.writeln(header('Docstring:\n') + indent(ds))
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|
# Original source code for any callable
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|
if detail_level:
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|
# Flush the source cache because inspect can return out-of-date
|
|
|
# source
|
|
|
linecache.checkcache()
|
|
|
source_success = False
|
|
|
try:
|
|
|
try:
|
|
|
src = getsource(obj,binary_file)
|
|
|
except TypeError:
|
|
|
if hasattr(obj,'__class__'):
|
|
|
src = getsource(obj.__class__,binary_file)
|
|
|
if src is not None:
|
|
|
source = self.format(src)
|
|
|
out.write(header('Source:\n')+source.rstrip())
|
|
|
source_success = True
|
|
|
except Exception, msg:
|
|
|
pass
|
|
|
|
|
|
if ds and not source_success:
|
|
|
out.writeln(header('Docstring [source file open failed]:\n')
|
|
|
+ indent(ds))
|
|
|
|
|
|
# Constructor docstring for classes
|
|
|
if inspect.isclass(obj):
|
|
|
# reconstruct the function definition and print it:
|
|
|
try:
|
|
|
obj_init = obj.__init__
|
|
|
except AttributeError:
|
|
|
init_def = init_ds = None
|
|
|
else:
|
|
|
init_def = self.__getdef(obj_init,oname)
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|
|
init_ds = getdoc(obj_init)
|
|
|
# Skip Python's auto-generated docstrings
|
|
|
if init_ds and \
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|
|
init_ds.startswith('x.__init__(...) initializes'):
|
|
|
init_ds = None
|
|
|
|
|
|
if init_def or init_ds:
|
|
|
out.writeln(header('\nConstructor information:'))
|
|
|
if init_def:
|
|
|
out.write(header('Definition:\t')+ self.format(init_def))
|
|
|
if init_ds:
|
|
|
out.writeln(header('Docstring:\n') + indent(init_ds))
|
|
|
# and class docstring for instances:
|
|
|
elif obj_type is types.InstanceType or \
|
|
|
isinstance(obj,object):
|
|
|
|
|
|
# First, check whether the instance docstring is identical to the
|
|
|
# class one, and print it separately if they don't coincide. In
|
|
|
# most cases they will, but it's nice to print all the info for
|
|
|
# objects which use instance-customized docstrings.
|
|
|
if ds:
|
|
|
try:
|
|
|
cls = getattr(obj,'__class__')
|
|
|
except:
|
|
|
class_ds = None
|
|
|
else:
|
|
|
class_ds = getdoc(cls)
|
|
|
# Skip Python's auto-generated docstrings
|
|
|
if class_ds and \
|
|
|
(class_ds.startswith('function(code, globals[,') or \
|
|
|
class_ds.startswith('instancemethod(function, instance,') or \
|
|
|
class_ds.startswith('module(name[,') ):
|
|
|
class_ds = None
|
|
|
if class_ds and ds != class_ds:
|
|
|
out.writeln(header('Class Docstring:\n') +
|
|
|
indent(class_ds))
|
|
|
|
|
|
# Next, try to show constructor docstrings
|
|
|
try:
|
|
|
init_ds = getdoc(obj.__init__)
|
|
|
# Skip Python's auto-generated docstrings
|
|
|
if init_ds and \
|
|
|
init_ds.startswith('x.__init__(...) initializes'):
|
|
|
init_ds = None
|
|
|
except AttributeError:
|
|
|
init_ds = None
|
|
|
if init_ds:
|
|
|
out.writeln(header('Constructor Docstring:\n') +
|
|
|
indent(init_ds))
|
|
|
|
|
|
# Call form docstring for callable instances
|
|
|
if hasattr(obj,'__call__'):
|
|
|
#out.writeln(header('Callable:\t')+'Yes')
|
|
|
call_def = self.__getdef(obj.__call__,oname)
|
|
|
#if call_def is None:
|
|
|
# out.writeln(header('Call def:\t')+
|
|
|
# 'Calling definition not available.')
|
|
|
if call_def is not None:
|
|
|
out.writeln(header('Call def:\t')+self.format(call_def))
|
|
|
call_ds = getdoc(obj.__call__)
|
|
|
# Skip Python's auto-generated docstrings
|
|
|
if call_ds and call_ds.startswith('x.__call__(...) <==> x(...)'):
|
|
|
call_ds = None
|
|
|
if call_ds:
|
|
|
out.writeln(header('Call docstring:\n') + indent(call_ds))
|
|
|
|
|
|
# Finally send to printer/pager
|
|
|
output = out.getvalue()
|
|
|
if output:
|
|
|
page(output)
|
|
|
# end pinfo
|
|
|
|
|
|
def psearch(self,pattern,ns_table,ns_search=[],
|
|
|
ignore_case=False,show_all=False):
|
|
|
"""Search namespaces with wildcards for objects.
|
|
|
|
|
|
Arguments:
|
|
|
|
|
|
- pattern: string containing shell-like wildcards to use in namespace
|
|
|
searches and optionally a type specification to narrow the search to
|
|
|
objects of that type.
|
|
|
|
|
|
- ns_table: dict of name->namespaces for search.
|
|
|
|
|
|
Optional arguments:
|
|
|
|
|
|
- ns_search: list of namespace names to include in search.
|
|
|
|
|
|
- ignore_case(False): make the search case-insensitive.
|
|
|
|
|
|
- show_all(False): show all names, including those starting with
|
|
|
underscores.
|
|
|
"""
|
|
|
#print 'ps pattern:<%r>' % pattern # dbg
|
|
|
|
|
|
# defaults
|
|
|
type_pattern = 'all'
|
|
|
filter = ''
|
|
|
|
|
|
cmds = pattern.split()
|
|
|
len_cmds = len(cmds)
|
|
|
if len_cmds == 1:
|
|
|
# Only filter pattern given
|
|
|
filter = cmds[0]
|
|
|
elif len_cmds == 2:
|
|
|
# Both filter and type specified
|
|
|
filter,type_pattern = cmds
|
|
|
else:
|
|
|
raise ValueError('invalid argument string for psearch: <%s>' %
|
|
|
pattern)
|
|
|
|
|
|
# filter search namespaces
|
|
|
for name in ns_search:
|
|
|
if name not in ns_table:
|
|
|
raise ValueError('invalid namespace <%s>. Valid names: %s' %
|
|
|
(name,ns_table.keys()))
|
|
|
|
|
|
#print 'type_pattern:',type_pattern # dbg
|
|
|
search_result = []
|
|
|
for ns_name in ns_search:
|
|
|
ns = ns_table[ns_name]
|
|
|
tmp_res = list(list_namespace(ns,type_pattern,filter,
|
|
|
ignore_case=ignore_case,
|
|
|
show_all=show_all))
|
|
|
search_result.extend(tmp_res)
|
|
|
search_result.sort()
|
|
|
|
|
|
page('\n'.join(search_result))
|
|
|
|
