A base-agnostic implementation of the Luhn Algorithm for Python. Useful for generating and verifying check digits.
Baluhn: Base-agnostic Luhn
Baluhn provides a base-independent implementation of the Luhn algorithm for Python. It is useful for generating and verifying check digits in arbitrary bases.
The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers in US and Canadian Social Insurance Numbers.
pip install baluhn or
python setup.py install.
baluhn module provides two functions:
generate calculates the Luhn check character for the given input string in
the given base. This character should be appended to the input string to
produce a valid Luhn string.
verify tests whether or not a string is a valid
Luhn string in the given base. By default, Baluhn operates in base 10:
>>> from baluhn import generate, verify >>> verify('5105105105105100') # MasterCard test number True >>> value = '510510510510510' # note the missing check digit >>> generate(value) '0' >>> verify(value + '0') True >>> verify(value + '7') False
When operating in a base other than decimal, encoder and decoder callables should be supplied. The encoder should take a single argument, an integer, and return the character corresponding to that integer in the operating base. Conversely, the decoder should take a string containing a single character and return its integer value in the operating base. Note that the mapping between values and characters defined by the encoder and decoder should be one-to-one.
For example, when working in hexadecimal:
>>> hex_alphabet = '0123456789abcdef' >>> hex_encoder = lambda i: hex_alphabet[i] >>> hex_decoder = lambda s: hex_alphabet.index(s) >>> value = 'a8b56f' >>> generate(value, base=16, encoder=hex_encoder, decoder=hex_decoder) 'b' >>> verify('a8b56fb', base=16, decoder=hex_decoder) True >>> verify('a8b56fc', base=16, decoder=hex_decoder) False
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