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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) 2008-2011 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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from .py3compat import string_types
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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def safe_hasattr(obj, attr):
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"""In recent versions of Python, hasattr() only catches AttributeError.
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This catches all errors.
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"""
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try:
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getattr(obj, attr)
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return True
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except:
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return False
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def get_class_members(cls):
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ret = dir(cls)
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if safe_hasattr(cls, '__bases__'):
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try:
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bases = cls.__bases__
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except AttributeError:
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# `obj` lied to hasattr (e.g. Pyro), ignore
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pass
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else:
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for base in 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 = set(dir(obj))
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if safe_hasattr(obj, '__class__'):
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#words.add('__class__')
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words |= set(get_class_members(obj.__class__))
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# for objects with Enthought's traits, add trait_names() list
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# for PyCrust-style, add _getAttributeNames() magic method list
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for attr in ('trait_names', '_getAttributeNames'):
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try:
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func = getattr(obj, attr)
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if callable(func):
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words |= set(func())
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except:
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# TypeError: obj is class not instance
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pass
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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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words = [w for w in words if isinstance(w, string_types)]
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return sorted(words)
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