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CCV.py
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CCV.py
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#---creating a Credit Card Validation App using Lunn's Algorithm---#
def user_input_card_no():
'''This function prompts the user to enter card numbe,
the card number must be of 16 characters'''
card_no = input("Enter a card number: ")
while True:
if len(card_no) != 16:
card_no = input("Enter a valid card number: ")
else:
return card_no
def credit_card_validation(card_no):
'''This function takes card_no as a parameter,
the function applies the Lhun's algorithm to check card validation
'''
list_card_no = list(card_no)
list_odd_idx = []
list_even_idx_doubles = []
for idx,val in enumerate(list_card_no):
if int(idx) % 2 != 0: #the condition for odd indexes that are used to append their values to the odd list
list_odd_idx.append(int(val))
if int(idx) % 2 == 0: #the conditino for even indexes that are used to append thier values to even list
list_even_idx_doubles.append(int(val)*2)
sum_even_idx = sum(list_odd_idx)
sum_of_single_odds_idx = [] # list to sum up the values of even indexes single digits
for idx,val in enumerate(list_even_idx_doubles):
'''this loop checks if the values of the even index are double digits,
then splits them and add the two together to make a single digit to append to the list of single_digits'''
if len(str(val)) == 2:
double_digits = list(str(val))
sum_of_doubles_digits = int(double_digits[0]) + int(double_digits[1])
sum_of_single_odds_idx.append(sum_of_doubles_digits)
else:
sum_of_single_odds_idx.append(int(val))
sum_of_odd_idx =sum(sum_of_single_odds_idx)
#Adding the total sums of both even and odd indexes lists
sum_of_card_no = sum_even_idx + sum_of_odd_idx
while True:
if sum_of_card_no % 10 == 0:
return "Credit Card is valid!, \nValidation: Successful"
else:
return "Credit Card is NOT valid! \nValidation: Unsuccessful"
def CCV():
'''this function serves as a construstor that ensures proper control flow
it utilizze the functions created above'''
card_no = user_input_card_no()
validation = credit_card_validation(card_no)
print(validation)
CCV()