LuhnExtended 1.0.1

A library for advanced Luhn algorithm operations

LuhnExtended

LuhnExtended is a Python library for advanced operations with the Luhn algorithm. It provides functions to generate, verify, and append Luhn check digits, with support for user-defined checksum values.

Features

• Checksum Calculation: Calculate the Luhn checksum for a given string of digits.
• Verification: Verify whether a string of digits satisfies the Luhn algorithm.
• Check Digit Generation: Generate the correct check digit to append to a string of digits.
• Append Check Digit: Easily append the correct Luhn check digit to a string.

Installation

Install the LuhnExtended library using pip directly from PyPI:

pip install LuhnExtended

Usage

Importing the Library

from LuhnExtended import checksum, verify, generate, append

Functions

checksum(string)

Compute the Luhn checksum for the provided string of digits. Note that this assumes the check digit is in place.

Example:

checksum_value = checksum("356938035643806")
print(checksum_value)  # Output: 7

verify(string, checksum_expected=0)

Check if the provided string of digits satisfies the Luhn checksum.

Parameters:

• string (str): The string of digits to verify.
• checksum_expected (int, optional): Expected checksum value.

Example:

# Test verification
is_valid = verify("356938035643806", 7)
print(f"Is ('356938035643806', 7) valid? {is_valid}")  # Expected output: True

is_invalid = verify("356938035643806", 0)
print(f"Is ('356938035643806', 0) valid? {is_invalid}")  # Expected output: False

is_invalid = verify("534618613411236", 7)
print(f"Is ('534618613411236', 7) valid? {is_invalid}")  # Expected output: False

generate(string, checksum_desired=0)

Generate the Luhn check digit to append to the provided string.

Parameters:

• string (str): The string of digits to generate a check digit for.
• checksum_desired (int, optional): Desired checksum value (default is 0).

Example:

check_digit = generate("35693803564380", 7)
print(f"Generated check digit for ('35693803564380', 7): {check_digit}")  # Output: 6

append(string, checksum_desired=0)

Append the Luhn check digit to the end of the provided string.

Parameters:

• string (str): The string of digits to append a check digit to.
• checksum_desired (int, optional): Desired checksum value (default is 0).

Example:

full_string = append("35693803564380", 7)
print(f"Appended check digit to ('35693803564380', 7): {full_string}")  # Output: '356938035643806'

Author

Developed by Luhn Extended.