Collatz Sequence

# python 2.7
def collatz(number):
    if number % 2 == 0:
        print number // 2
        return number // 2
    elif number % 2 == 1:
        result = (3 * number + 1)
        print result
        return result
 
def run_collatz():
    try:
        n = input("Give me a number: ")
        if isinstance(n, (int,float)):
            n = int(n)
            while n != 1:
                n = collatz(n)
        elif isinstance(n, (str)):
            print n," is a string, give me a number"
            run_collatz()
        else:
            print ("Please input a valid number")
            run_collatz()
    except NameError:
        print "oops! that doesn't look like a number"
        run_collatz()

credit: https://stackoverflow.com/questions/33508034/making-a-collatz-program-automate-the-boring-stuff