

def Luhn(card_number):
    def digits_of(n):
        return [int(d) for d in str(n)]
    digits = digits_of(card_number)
    odd = digits[-1::-2]
    even = digits[-2::-2]
    checksum = 0
    checksum += sum(odd_digits)
def checksum(card_number):
    return luhn(card_number)



def Luhn(card_number):
    def digits_of(n):
        return [int(d) for d in str(n)]
    digits = digits_of(card_number)
    odd = digits[-1::-2]
    even = digits[-2::-2]
    checksum = 0
    checksum += sum(odd_digits)
    for d in even_digits:
        checksum += sum(digits_of(d*2))
    return checksum % 10
def checksum(card_number):
    return luhn(card_number)

Return the remainder of checksum
Return the remainder of checksum

  
  
  def Luhn(card_number):
      def digits_of(n):
          return [int(d) for d in str(n)]
      digits = digits_of(card_number)
      odd = digits[-1::-2]
      even = digits[-2::-2]
      checksum = 0
      checksum += sum(odd_digits)
+     for d in even_digits:
+         checksum += sum(digits_of(d*2))
+     return checksum % 10
  def checksum(card_number):
      return luhn(card_number)
  
Return the remainder of checksum
## Code Before:


def Luhn(card_number):
    def digits_of(n):
        return [int(d) for d in str(n)]
    digits = digits_of(card_number)
    odd = digits[-1::-2]
    even = digits[-2::-2]
    checksum = 0
    checksum += sum(odd_digits)
def checksum(card_number):
    return luhn(card_number)

## Instruction:
Return the remainder of checksum
## Code After:


def Luhn(card_number):
    def digits_of(n):
        return [int(d) for d in str(n)]
    digits = digits_of(card_number)
    odd = digits[-1::-2]
    even = digits[-2::-2]
    checksum = 0
    checksum += sum(odd_digits)
    for d in even_digits:
        checksum += sum(digits_of(d*2))
    return checksum % 10
def checksum(card_number):
    return luhn(card_number)
