function wont print parameter (python 3.x)

Asked Oct 24 '16 at 09:35

Active Oct 24 '16 at 09:35

Viewed 17 times

i was just wondering why the parameter won't print in the following program?Thanks

def my_func(param):
    param = param.append(4)
    print(param) #prints none
    return param

mylist = [1, 2, 3]
newlist = my_func(mylist)
print(mylist, newlist) #prints [1,2,3,4] none

asked Oct 24 '16 at 09:35

jack

3

`list.append()` alters the list *in place* and returns `None`, which you then assign to the `param` name. Don't assign back to `param` (remove the `param =` part) – Martijn Pieters Oct 24 '16 at 09:36
@martjin, got it thanks a lot ! – jack Oct 24 '16 at 09:39

function wont print parameter (python 3.x)

0 Answers0