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from typing import List
def luhn_checksum(number: float) -> int:
def digits_of(n: float) -> List[int]:
return [int(d) for d in str(n)]
digits = digits_of(number)
odd_digits = digits[-1::-2]
even_digits = digits[-2::-2]
checksum = 0
checksum += sum(odd_digits)
for d in even_digits:
checksum += sum(digits_of(d * 2))
return checksum % 10
def calculate_luhn(partial_number: float) -> int:
"""
Generates the Checksum using Luhn's algorithm
"""
check_digit = luhn_checksum(int(partial_number) * 10)
return check_digit if check_digit == 0 else 10 - check_digit
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