Reference Or Value pass in python

Preface

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(1)Pass/call-by-Reference OR Pass-by Value also exists in Python(like:Python2.7);

(2)Commonly,if such immutable type arguments as Integers,Strings or tuples are passed to a functions , the passing acts like pass-by-call. In other words, callee(被調用者) functions can not change value of that kind of arguments passed by caller(調用者) ones. While situation is different when mutable type ones like list or dict are passed.