[issue37685] Fix equality checks for some types

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

The __eq__ implementation should return NotImplemented instead of False or raising an exception (like AttributeError or TypeError) when it does not support comparison with the other operand's type. It is so for most of implementations in the stdlib, but there are several exceptions. The proposed patch fixes these cases.

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components: Library (Lib)
messages: 348452
nosy: serhiy.storchaka
priority: normal
severity: normal
status: open
title: Fix equality checks for some types
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9

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<https://bugs.python.org/issue37685>
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