How to change global variable in function?

[buran]

that would be the better approach.
However you should know that list is a mutable type, and you can change the list elements inside the function without using global

my_list = [1, 2]
def change_list():
    my_list[0] = 3
    my_list[1] = 4

change_list()
print(my_list)

def change_list1(some_list):
    some_list[0] = 10
    some_list[1] = 11

change_list1(my_list)
print(my_list)

def change_list2():
    return [5, 6]

my_list = change_list2()
print(my_list)

Output:
[3, 4]
[10, 11]
[5, 6]