Operator overloading allows user-defined objects to interoperate with infix operators such as + and | or unary operators like - and ~ . More generally, function invocation（()）, attribute access （.）, and item access/slicing （[]） are also operators in Python.
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Operator Overloading:Doing It Right
原文：https://www.cnblogs.com/neozheng/p/12381272.html