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how arguments are passed by value or by reference ?

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    how arguments are passed by value or by reference ?

    An object oriented language which that all variables hold references to their objects in Python. The references values execute are according to the given functions and as a following result the value of references can't be changed. and the objects can be changed if it is mutable. 

    def function(my_dict): 
        my_dict["a"] = 1

    d = {}

    function(d)

    print d

    # {'a': 1}

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    how arguments are passed by value or by reference ?

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