New submission from Carl Johnson <c...@carlsensei.com>:
The documentation at http://docs.python.org/library/rlcompleter.html
claims that
Completer.complete(text, state)¶
Return the state*th completion for *text.
If called for text that doesn’t include a period character ('.'), it
will complete from names currently defined in __main__, __builtin__ and
keywords (as defined by the keyword module).
If called for a dotted name, it will try to evaluate anything without
obvious side-effects (functions will not be evaluated, but it can
generate calls to __getattr__()) up to the last part, and find matches
for the rest via the dir() function. Any exception raised during the
evaluation of the expression is caught, silenced and None is returned.
In other words, it claims to use dir(obj) as part of the tab completion
process. This is not true (using Python 2.6.1 on OS X):
>>> class B(object):
... def __dir__(self): return dir(u"") #Makes B objects look like strings
...
>>> b = B()
>>> dir(b)
['__add__', '__class__', '__contains__', '__delattr__', '__doc__',
'__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__',
'__getnewargs__', '__getslice__', '__gt__', '__hash__', '__init__',
'__le__', '__len__', '__lt__', '__mod__', '__mul__', '__ne__',
'__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmod__',
'__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__',
'_formatter_field_name_split', '_formatter_parser', 'capitalize',
'center', 'count', 'decode', 'encode', 'endswith', 'expandtabs', 'find',
'format', 'index', 'isalnum', 'isalpha', 'isdecimal', 'isdigit',
'islower', 'isnumeric', 'isspace', 'istitle', 'isupper', 'join',
'ljust', 'lower', 'lstrip', 'partition', 'replace', 'rfind', 'rindex',
'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines',
'startswith', 'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill']
>>> c = rlcompleter.Completer()
>>> c.complete("b.", 0) #Notice that it does NOT return __add__
u'b.__class__('
>>> c.matches #Notice that this list is completely different from the
list given by dir(b)
[u'b.__class__(', u'b.__delattr__(', u'b.__doc__', u'b.__format__(',
u'b.__getattribute__(', u'b.__hash__(', u'b.__init__(', u'b.__new__(',
u'b.__reduce__(', u'b.__reduce_ex__(', u'b.__repr__(',
u'b.__setattr__(', u'b.__sizeof__(', u'b.__str__(',
u'b.__subclasshook__(', u'b.__class__(', u'b.__class__(',
u'b.__delattr__(', u'b.__dict__', u'b.__dir__(', u'b.__doc__',
u'b.__format__(', u'b.__getattribute__(', u'b.__hash__(',
u'b.__init__(', u'b.__module__', u'b.__new__(', u'b.__reduce__(',
u'b.__reduce_ex__(', u'b.__repr__(', u'b.__setattr__(',
u'b.__sizeof__(', u'b.__str__(', u'b.__subclasshook__(',
u'b.__weakref__', u'b.__class__(', u'b.__delattr__(', u'b.__doc__',
u'b.__format__(', u'b.__getattribute__(', u'b.__hash__(',
u'b.__init__(', u'b.__new__(', u'b.__reduce__(', u'b.__reduce_ex__(',
u'b.__repr__(', u'b.__setattr__(', u'b.__sizeof__(', u'b.__str__(',
u'b.__subclasshook__(']
Suggested course of action:
* Change the documentation for Python 2.6/3.0.
* Update Completer to use __dir__ in Pythons 2.7/3.1 and revert the
documentation.
See
http://mail.python.org/pipermail/python-dev/2009-January/thread.html#85471
----------
assignee: georg.brandl
components: Documentation, Extension Modules
messages: 80556
nosy: carlj, georg.brandl
severity: normal
status: open
title: Rlcompleter.Completer does not use __dir__ magic method
type: behavior
versions: Python 2.6, Python 3.0
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5062>
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