[issue22721] pprint output for sets and dicts is not stable

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

And here is alternative patch if the first patch is not correct. It is more complicated and I suppose is less efficient in common case.

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Added file: http://bugs.python.org/file37013/pprint_safe_key_alt.patch

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<http://bugs.python.org/issue22721>
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