Serhiy Storchaka added the comment:

has_key(u"x") works if x is a valid key.

has_key() parses the argument with PyArg_ParseTuple("s#") which implicitly 
converts unicode to str. __contains__() explicitly checks for str type.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31398>
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