Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
Not all types are orderable.
>>> sorted({'', None})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: '<' not supported between instances of 'NoneType' and 'str'
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nosy: +serhiy.storchaka
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34722>
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