Antti Haapala added the comment:
I can reproduce the bug in 3.5.0+ Ubuntu with list iterator, if I execute
python with -S:
% python3.5 -S
Python 3.5.0+ (default, Oct 11 2015, 09:05:38)
[GCC 5.2.1 20151010] on linux
>>> format(iter([]))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Type list_iterator doesn't define __format__
Thus here it depends on the stuff that site does or doesn't do. Iterating over
a list iterator does *not* trigger the initialization. Printing it doesn't help
either, or anything else that does not touch the non-magic attributes. I am not
even sure what the site.py and such are doing to the list iterator class to
trigger the initialization.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26906>
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