ParseError: Bad input on line

Here is part of my code:

sum1 = sum1 + (GTINList[each]*3)
        sum1 = sum1 + (GTINList[1]+GTINList[3]+GTINList[5]+GTINLIst[7])
        remainder = sum1 % 10
        if remainder == 0 :
          print ("Valid GTIN")
          else: