Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:
The error is in line 51 which should be: x3=tuple(sorted(x))
That will make sure you always get {('A', 'B')} instead of {('B', 'A')}.
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nosy: +rhettinger
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39175>
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