[issue20192] pprint chokes on set containing frozenset

[R. David Murray]

R. David Murray added the comment:

FYI, 'crash' is for when the CPython interpreter segfaults, not when python produces a traceback.

Sets and frozensets are not comparable to anything except themselves, unlike most other Python2 datatypes.  In Python3, most disparate types are not comparable, including sets and frozensets.

To fix this issue in 2.7's pprint I think we would have to backport the fix from issue 3976.

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components: +Library (Lib)
nosy: +r.david.murray
type: crash -> behavior

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