Making list empty after return in function

[dan789]

But when I make it like this:

def flatten(nested_list):
    result = []
    for i in nested_list:
        if type(i) != list:
            result.append(i)
        else:
            flatten(i)
    return result

it clears the list every time when calling a recursion. So from input flatten([0,1,2,[3,4]]) I get output just [0,1,2]