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a = a + 1
a += b is essentially the same as a = a + b , except that: + always returns a newly allocated object, but += should (but doesn't have to) modify the object in-place if it's mutable (e.g. list or dict, but int and str are immutable); In a = a + b ,a is evaluated twice. (stackoverflow.com/questions/823561/what-does-mean-in-pyth...)
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