Check with Luhn
The Luhn algorithm is used for quick validation of numeric codes, helping catch accidental digit mistakes. The function valid receives a string card_num and checks it with this algorithm, ignoring spaces. A string with only one digit, or with any characters other than digits and spaces, is invalid.
Примеры
Ввод
"1"Вывод
FalseВвод
"0"Вывод
FalseВвод
"059"Вывод
TrueНужно реализовать
def valid(card_num: str) -> bool:
Теги
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