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2_separate_cmd_query.py
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2_separate_cmd_query.py
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from dataclasses import dataclass
from datetime import datetime
def luhn_checksum(card_number: str) -> bool:
def digits_of(number: str) -> list[int]:
return [int(d) for d in number]
digits = digits_of(card_number)
odd_digits = digits[-1::-2]
even_digits = digits[-2::-2]
checksum = 0
checksum += sum(odd_digits)
for digit in even_digits:
checksum += sum(digits_of(str(digit * 2)))
return checksum % 10 == 0
@dataclass
class Customer:
name: str
phone: str
cc_number: str
cc_exp_month: int
cc_exp_year: int
cc_valid: bool = False
def validate_card(customer: Customer) -> bool:
return (
luhn_checksum(customer.cc_number)
and datetime(customer.cc_exp_year, customer.cc_exp_month, 1) > datetime.now()
)
def main() -> None:
alice = Customer(
name="Alice",
phone="2341",
cc_number="1249190007575069",
cc_exp_month=1,
cc_exp_year=2024,
)
alice.cc_valid = validate_card(alice)
print(f"Is Alice's card valid? {alice.cc_valid}")
print(alice)
if __name__ == "__main__":
main()