[issue25856] The __module__ attribute of non-heap classes is not interned

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Interning the __module__ string causes small performance hit:

$ ./python -m timeit -s "from itertools import chain" -- "chain.__module__; chain.__module__; chain.__module__; chain.__module__; chain.__module__; chain.__module__; chain.__module__; chain.__module__; chain.__module__; chain.__module__"

Unpatched:  1.93 usec per loop
Patched:    4.09 usec per loop

This can be avoided if cache created string in type's __dict__. Following patch makes __module__ retrieving for non-heap types as fast as for heap types:

Patched2:   0.871 usec per loop

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type: performance -> enhancement
Added file: http://bugs.python.org/file41443/intern_and_cache___module__.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25856>
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