Explanation of how variable names work in Python

example.py

def change_variable(x):
    x = 100

a = 3

print(a)
change_variable(a)
print(a)

b = [1, 2]

print(b)
change_variable(b)
print(b)


def change_list_item(x):
    x.append(100)

c = [1, 2]

print(c)
change_list_item(c)
print(c)