The Collatz Sequence

[vaison]

Hello,

I think that in your first iteration you're still comparing a char with an integer. Try to introduce '1' and verify if the execution doesn't enter to the loop. I think that you must do the cast to integer in the input() function and not in the collatz function.

try:
    n = int(input("Give me a number: "))
    while n != 1:
        print(n)
        n = collatz(abs(n))
except ValueError:
    print('Type a number please!')

What do you think?