Collatz Conjecture in Python

Just for fun, I wrote a Python script showing how the Collatz Conjecture works:

def collatz(num):
    while num != 1:
        print(num)
        if num % 2 == 0:
            num = int(num / 2)
        else:
            num = int(3 * num + 1)
    else:
        print(num)
        print('Done!')


def main():
    num = int(input('Input an integer: '))
    collatz(num)
main()

The script will output something like this:

Input an integer: 12
12
6
3
10
5
16
8
4
2
1
Done!

Enjoy!