In my Python console triple_double(1222345, 12345) returns 0 but it fails on here. Any reason why?

def triple_double(num1, num2):
    num1 = list(str(num1))
    num2 = list(str(num2))

    for digit in num1:
        if digit in num2 and num1.count(digit) >= 2 and num2.count(digit)>=2:
            return 1
    print 0

My code passes the test cases fine in python but fails here. Any ideas why?

"5.1 should equal 5.10"

How can I fix this?