If the argument is not int then make it int!

[deanhystad]

I think you are trying to write:

if type(n) is not int:
    n = int(n)

But since it is valid to pass an integer to int() why not just do this?

def countdown(n):
    n = int(n)
    while n > 0:
        print(n)
        n = n - 1
    print('Blastoff!')

Or this

def countdown(n):
    for i in range(int(n), 0, -1):
        print(i)
    print('Blastoff!')