Python: list is not mutated after for loop

Question

a =[1,2]
for entry in a:
    entry = entry + 1
print a  

Shouldn\'t the list be mutated to[2,3]? The result came out as [1,2]

Answer 1

No, why should it?

entry is just a name, which the for loop assigns to each integer in the list. If you subsequently reassign that name to point to a different integer, the list doesn't care.