[issue25447] TypeError invoking deepcopy on lru_cache

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The Python implementation survives a deepcopy because the Python implementation has a function type, and functions functions are copied as atoms.

Proposed patch just implements __copy__ and __deepcopy__ methods that returns the object itself for the lru_cache object.

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stage: resolved -> patch review
Added file: http://bugs.python.org/file41435/lru_cache_simple_copy.patch

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