[issue25718] itertools.accumulate __reduce__/__setstate__ bug

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Well, we can fix this without breaking the protocol. The accumulate() object with state is None can be reconstructed as islice(accumulate(chain([None], iterator)), 1, None).

Proposed patch implements this solution.

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Added file: http://bugs.python.org/file41261/itertools_accumulate_state_is_none.patch

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