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        "author": "Johannes Spielmann",
        "author_email": "jps@shezi.de",
        "bugtrack_url": null,
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            "Development Status :: 4 - Beta",
            "Environment :: Console",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 2.7",
            "Programming Language :: Python :: 3",
            "Topic :: Software Development :: Libraries",
            "Topic :: Software Development :: Libraries :: Python Modules"
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        "description": "Damm algorithm decimal check digit\n----------------------------------\n\nNote that check digits are NOT used for verification of data transfers between\ncomputers -- use a CRC or a hash for that purpose! Check digits are used to\ncheck *manual* entry of a digit into a computer system.\n\nA Damm check digit is a single check digit that can detect any\nsingle-digit error as well as any adjacent-digit transpositions. The digit\ncomputed in this module also detects some important phonetic errors (13<->30,\n14<->40, ... 19<-->90).\n\nThis makes the Damm check digit better than other, more well-known check digits\nlike the Luhn code (used in credit cards) and the ISBN base-11 check digit. It\nis equal in detection strength to a Verhoeff check digit, but much simpler to\ncompute.\n\nFurthermore, a hexadecimal Damm check digit was added. This single hexadecimal\ncheck digit that detects every single-digit error as well as any adjacent-digit\ntranspositions. The digit computed in this module also detects some important\nphonetic errors (13<->30, 14<->40, ... 19<-->90). It also detects all\njump-transposition errors (abc -> cba), 93.5 % of all twin digit errors (aa ->\nbb) and 93.5 % of all jump twin digit errors (aca -> bcb).\n\nThere are four functions in this module: `encode`, `encode16`, `check` and\n`check16`. The first two, `encode` and `encode16` are used to calculate the\ncheck digit for a number that you have. Pass in a string with the number you\nwant encoded and get a string with the check digit back. The other two, `check`\nand `check16` are used to check that a number that was entered was entered\ncorrectly. Pass in a string with a number including check digit and get back\n`True`/`False`.\n\n\nDamm algorithm\n--------------\n\nThe Damm check digit is computed by starting with a check digit of zero and then\ncontinually multiplying this check digit with the digits of a given number,\nusing the multiplication of a totally anti-symmetric quasigroup. The properties\nand the selection of the group ensure the qualities of the check digit stated\nabove.\n\nFor further reference on how the algorithm works see\nhttp://en.wikipedia.org/wiki/Damm_algorithm\n  \n  \nLicense information\n-------------------\n\nCopyright (C) 2013 Johannes Spielmann\n\nThis module, `damm`, is licensed under the terms of the GNU General Public Licenses as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.\n\nFor a full description of the license, please see the file\n\n  LICENSE",
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