Unnamed

def verify_sin(sin):    count = -1    sum1 = 0    sum2 = 0    '''Given a string argument returns True if the string entered represents     a valid sin number. Otherwise returns False.'''        for digit in sin:        if digit != '-':#Prevents '-' from being counted as a numerical digit.            count += 1 #Updates the count to reflect the position of the digit.                    if digit != '-' and count / 2 == count / 2.0 and count < 8: #Prevents            # -'s from being treated like numbers and ensures that only every             # other number is used (excluding the checksum).            sum1 += int(digit)        if digit!='-' and count / 2 != count / 2.0 and count < 8 and int(digit)\           * 2 < 10:            sum2 = sum2 + (int(digit) * 2) #Multiplies the remaining digits by 2            #and sums them, provided the product is a single digit value.        if digit != '-' and count / 2 != count/2.0 and count < 8 and int(digit)\           * 2 >= 10:            sum2 = sum2 + int(digit) * 2 / 10 + int(digit) * 2 % 10 #Takes the             #sum of any digits whose product when multiplied by two produces             #a two digit number, summing the digits separately.    sum_final = sum1 + sum2    sum_final = sum_final % 10    sum_final = 10 - sum_final    return str(sum_final) == sin[10]