wonder.py

wonder_numbers = set([2])
temp_wonder_numbers = set()

def wonder(n):
    n = int(n)
    if n in wonder_numbers:
        print('n is a wonder number')
        for i in temp_wonder_numbers:
            wonder_numbers.add(i)
        return
    if not(n % 2):
        print(n, ' is an even number, so I will half it which is: ', int(n / 2))
        temp_wonder_numbers.add(n)
        wonder(n / 2)
    else:
        print(n, 'is an odd number so I will do it times three and append it with one: ', 3 * n + 1)
        temp_wonder_numbers.add(n)
        wonder(3 * n + 1)