角古猜想python

def f(n):
    if n%2 == 0 :
        n = n // 2
    else:
        n = n*3 +1
    return n
num = eval(input())
if type(num) == int and num>0:
    count = 0
    print(num,end = ' ')
    while num != 1:
        count += 1
        num = f(num)
        print(num, end = ' ')
    print()
    print(count)
else:
    print('ERROR')