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#727519
def verify_isbn(isbn): if ( type(isbn) != str ): return False isbn = isbn.replace('-', '') if ( len(isbn) != 10 ): return False sum = 0 count = 10 for digit in isbn[0:-1]: sum += int(digit) * count count -= 1 sum = (11 - ( sum % 11 )) % 11 if ( sum == 10 ): return "X" == isbn[-1] else: return str(sum) == isbn[-1]