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Row-first option for columnize
Row-first option for columnize

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dir2.py
58 lines | 1.9 KiB | text/x-python | PythonLexer
# encoding: utf-8
"""A fancy version of Python's builtin :func:`dir` function.
"""
#-----------------------------------------------------------------------------
# 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 .py3compat import string_types
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
def safe_hasattr(obj, attr):
"""In recent versions of Python, hasattr() only catches AttributeError.
This catches all errors.
"""
try:
getattr(obj, attr)
return True
except:
return False
def dir2(obj):
"""dir2(obj) -> list of strings
Extended version of the Python builtin dir(), which does a few extra
checks, and handles Traits objects, which can confuse dir().
This version is guaranteed to return only a list of true strings, whereas
dir() returns anything that objects inject into themselves, even if they
are later not really valid for attribute access (many extension libraries
have such bugs).
"""
# Start building the attribute list via dir(), and then complete it
# with a few extra special-purpose calls.
try:
words = set(dir(obj))
except Exception:
# TypeError: dir(obj) does not return a list
words = set()
# filter out non-string attributes which may be stuffed by dir() calls
# and poor coding in third-party modules
words = [w for w in words if isinstance(w, string_types)]
return sorted(words)