Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

PR 4501 makes the parser emitting a SyntaxWarning for chained `in` and `not in` 
comparison operators. In future it can be turned into a SyntaxError.

But this should be first discussed on Python-Dev.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32055>
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