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Python exercise
Debit card
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# Debit card program
# -------------------------
# Subprograms
# -------------------------
def validate_number(number_on_card):
valid = True
number_of_characters = len(number_on_card)
if number_of_characters == 16 or number_of_characters == 19:
for character in number_on_card:
if not character.isdigit() and character != " ":
valid = False
else:
valid = False
return valid
def input_card_details():
valid_card = False
while not valid_card:
number_input = input("Enter the 16 digit number: ")
valid_card = validate_number(number_input)
# -------------------------
# Main program
# -------------------------
input_card_details()
print("Card details valid.")