[issue31428] ElementTree.Element.__deepcopy__() raises a SystemError in case of a bad memo

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I suppose the Python implementation supports arbitrary mapping, not just dict. We could use general mapping API in the C implementation, but I think it isn't worth. __deepcopy__ is used internally by copy.deepcopy(), which always passes a dict. I think it isn't worth to backport a fix, and it doesn't need tests. The behavior of calling __deepcopy__ with non-dict is implementation detail. But it shouldn't crash or raise SystemError.

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versions:  -Python 2.7, Python 3.6

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