Detailed explanation of function passing by value and reference in python

In python, functions such as integers, strings, and tuples are all passed by value. Their values ​​will not be changed in the function. Others will change their values ​​in the function.

For example, passing a list:

#-*-ecoding:UTF-8 -*-
def fun(a):
    a[0]="sss";
    print a
    print id(a)
    return ;
a=["a","b"];
fun(a);
print a;
print id(a)

The value in the list has changed, but the address of the list has not changed

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