[issue46612] Unclear behavior of += operator

[Vedran Čačić]

Vedran Čačić <vedgar at 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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<https://bugs.python.org/issue46612>
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