Optimization with the in-place operators
Generally, numbers are immutable. However, the numeric operators are also used for mutable objects. Lists and sets, for example, respond to a few of the defined augmented assignment operators. As an optimization, a class can include an in-place version of a selected operator. These methods implement the augmented assignment statements for mutable objects. Note that these methods are expected to end with return self
to be compatible with ordinary assignment.
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