Vedran Čačić <ved...@gmail.com> added the comment:
You've managed to write 3 messages already, without at any point mentioning
what _really_ happens when you += something.
a += b means (is closest to) a = type(a).__iadd__(a, b)
You focus all the time on __iadd__ call, disregarding that its result it
assigned back to a in scope.
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nosy: +veky
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46612>
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