Question regarding local and global variables

[buran]

names in python are just pointers, at the beginning name a points to an int object - 20 with id 4428144000
after you call the function name a points to different int object - 12 (i.e. different location in memory, thus different id 4428144032)
as you can see c is pointing to same object, although element at index 0 has changed (which is possible, because lists are mutable objects).

Read this https://nedbatchelder.com/text/names1.html

also

a = 5
b = 5
print(id(a), id(b))

Output:
11381600 11381600