I’m looking for feedback or tips to maybe make my code more readable or faster or just general tips to help get myself started with app making with Python.
import sys # check for valid input if len(sys.argv) == 2: try: int(sys.argv[1]) if(len(str(sys.argv[1])) == 16): pass else: print("Not 16 digits!") sys.exit() except ValueError: print('Not an integer!') sys.exit() else: print('Not enough or too many command line arguments! \n Proper use \"python Check.py <credit card number here> \" ') sys.exit() def main(): # put the digits into a list number = convertToList(sys.argv[1]) sum = cardCheck(number) if (sum%10 == 0): print('Valid Card!') else: print('Invalid Card!') #converts initial passed int variable to list def convertToList(num): numStr = str(num) numList = [] for digit in numStr: numList.append(int(digit)) return (numList) def cardCheck(digitList, count = 0): sum = 0 #if digit is every second digit multiply by 2 if(count%2 == 0 & count < 15): digitList[count] = (digitList[count] * 2) #if is 2 digit number after multiplication if(digitList[count] >= 10): digitList[count] = addDigits(digitList[count]) cardCheck(digitList, count + 1) else: cardCheck(digitList, count + 1) #progresses program elif(count < 15): cardCheck(digitList, count + 1) else: return 0 for digits in digitList: sum += int(digits) return sum #resolve 2 digit number conflict by adding the digits of the number and returning it def addDigits(num): list = str(num) sum = 0 for digits in list: sum += int(digits) return sum if __name__ == '__main__': main() 