Christian Barcenas added the comment:

Should have clarified that the specific issue that is outlined in #5945 is that 
PyMapping_Check returns 1 on sequences (e.g. lists), which would mean something 
like x = [('one', 1), ('two', 2)]; dict(x) would fail in 3.x because x would be 
incorrectly evaluated as a mapping rather than as an iterable.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24659>
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