如何从子函数更改局部变量

Question

I have following code:

my_var=1
def a():  
    def b():
        my_var=2
    b()
    return my_var

print(a())

I'm trying to change the variable my_var in sub-function b() . The result should be 2 instead of 1. But in my code, it doesn't work. How can I solve this problem?

Answer 1

global is the keyword used in python to access the actual variable which is present outside function try out the below code.

my_var=1
def a(): 
    def b():
        global my_var
        my_var = 2
    b()
    return my_var

print(a())