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# encoding: utf-8
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"""A fancy version of Python's builtin :func:`dir` function.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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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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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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def get_class_members(cls):
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ret = dir(cls)
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if hasattr(cls,'__bases__'):
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for base in cls.__bases__:
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ret.extend(get_class_members(base))
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return ret
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def dir2(obj):
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"""dir2(obj) -> list of strings
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Extended version of the Python builtin dir(), which does a few extra
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checks, and supports common objects with unusual internals that confuse
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dir(), such as Traits and PyCrust.
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This version is guaranteed to return only a list of true strings, whereas
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dir() returns anything that objects inject into themselves, even if they
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are later not really valid for attribute access (many extension libraries
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have such bugs).
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"""
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# Start building the attribute list via dir(), and then complete it
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# with a few extra special-purpose calls.
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words = dir(obj)
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if hasattr(obj,'__class__'):
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words.append('__class__')
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words.extend(get_class_members(obj.__class__))
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#if '__base__' in words: 1/0
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# Some libraries (such as traits) may introduce duplicates, we want to
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# track and clean this up if it happens
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may_have_dupes = False
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# this is the 'dir' function for objects with Enthought's traits
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if hasattr(obj, 'trait_names'):
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try:
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words.extend(obj.trait_names())
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may_have_dupes = True
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except TypeError:
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# This will happen if `obj` is a class and not an instance.
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pass
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# Support for PyCrust-style _getAttributeNames magic method.
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if hasattr(obj, '_getAttributeNames'):
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try:
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words.extend(obj._getAttributeNames())
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may_have_dupes = True
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except TypeError:
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# `obj` is a class and not an instance. Ignore
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# this error.
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pass
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if may_have_dupes:
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# eliminate possible duplicates, as some traits may also
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# appear as normal attributes in the dir() call.
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words = list(set(words))
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words.sort()
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# filter out non-string attributes which may be stuffed by dir() calls
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# and poor coding in third-party modules
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return [w for w in words if isinstance(w, basestring)]
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