STINNER Victor <victor.stin...@haypocalc.com> added the comment:
>>> class Spam(object):
... def __getattribute__(self, name):
... if name == '__class__':
... return str
... raise AttributeError
...
>>> spam = Spam('spam')
>>> isinstance(spam, str)
True
isinstance(spam, str) calls str.__instancecheck__(spam)
(type___instancecheck__) which checks spam.__class__, and spam.__class__ is str.
--
>>> import re
>>> re.match('spam', spam)
TypeError: expected string or buffer
Here the result is different because _sre.compile(spam) calls getstring() which
uses PyUnicode_Check(spam) (-> False) and does checks on the buffer API (->
False).
--
About str.title(spam): it calls methoddescr_call() which checks the type
using... PyObject_IsInstance() (and not PyUnicode_Check()).
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9756>
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