Serhiy Storchaka added the comment:

This issue was fixed by issue22995 in 3.6. But for some reasons the general 
solution was not applied to 3.5 and 2.7. Proposed patch makes staticmethod, 
classmethod and property descriptors explicitly non-pickleable (as was made 
explicitly non-pickleable file-like object) in 3.5. Only tests will be 
foreported to 3.6 and 3.7.


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