[issue21205] Add __qualname__ attribute to Python generators and change default __name__

[STINNER Victor]

STINNER Victor added the comment:

Updated patch: names must now be strings and cannot be deleted; make _PyEval_EvalCodeWithName private.

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Added file: http://bugs.python.org/file35611/gen_qualname-3.patch

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<http://bugs.python.org/issue21205>
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