python pass list as function parameter

Question

folks,

The result of the following code is [] Why is it not ['0','1','2']? If I want to make psswd equal to number in the function foo, what should I do?

number = ['0','1','2']
def foo(psswd):
    psswd = number[:]

if __name__ == '__main__':
    psswd = []
    foo(psswd)
    print psswd

Answer 1

You need to mutate instead of rebinding, with slice-assigning.

psswd[:] = number[:]