[Python-ideas] Unpacking iterables for augmented assignment

[James Lu]

I propose we apply PEP 3132 to PEP 203. That is, for every statement where
"<lhs> = <rhs>" is valid I propose "lhs += rhs" should also be valid.

Simple example:
a = 0
b = 0
a, b += 1, 2
# a is now 1
# b is now 2
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