[issue27495] Pretty printing sorting for set and frozenset instances

[SilentGhost]

Change by SilentGhost <ghost.adh at runbox.com>:


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nosy: +SilentGhost
type: enhancement -> behavior
versions: +Python 3.7, Python 3.8, Python 3.9 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27495>
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