Preface
(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(被调用者) functions can not change value of that kind of arguments passed by caller(调用者) ones. While situation is different when mutable type ones like list or dict are passed.