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Modernize code: "== None" -> "is None" (#2081)

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Dimitri Papadopoulos Orfanos 2021-09-21 21:55:36 +02:00 committed by GitHub
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pep-0316.txt
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@ -298,7 +298,7 @@ A somewhat contrived example::
Returns None if no message is available.
pre: self.is_open() # we must have an open connection
post: __return__ == None or isinstance(__return__, Message)
post: __return__ is None or isinstance(__return__, Message)
"""
class ComplexMailClient(SimpleMailClient):