New submission from Antti Haapala:
This is an annoying heisenbug; it seems that some objects cannot be formatted
until you explicitly do obj.__format__. For example `object.__reduce__` behaves
like this:
Python 2.7.10 (default, Oct 14 2015, 16:09:02)
[GCC 5.2.1 20151010] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> format(object.__reduce__)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Type method_descriptor doesn't define __format__
>>> format(object.__reduce__)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Type method_descriptor doesn't define __format__
>>> object.__reduce__.__format__
<built-in method __format__ of method_descriptor object at 0x7f67563ed0e0>
>>> format(object.__reduce__)
"<method '__reduce__' of 'object' objects>"
I can replicate this in 2.7.9, .10 and .11 on Ubuntu and Debian, though it
works on Windows Python, works in 2.6.6, and Pythons 3 wherever I've tried, but
I've heard this also failing on Python 3.
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title: __reduce__ format -> format(object.__reduce__) fails intermittently
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26906>
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