84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
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# nit.py - functions for handling Colombian identity codes
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# coding: utf-8
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#
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# Copyright (C) 2008-2011 Cédric Krier
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# Copyright (C) 2008-2011 B2CK
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# Copyright (C) 2015 Arthur de Jong
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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"""NIT (Número De Identificación Tributaria, Colombian identity code).
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This number, also referred to as RUT (Registro Unico Tributario) is the
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Colombian business tax number.
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>>> validate('213.123.432-1')
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'2131234321'
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>>> validate('2131234325')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> format('2131234321')
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'213.123.432-1'
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"""
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from stdnum.exceptions import *
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from stdnum.util import clean
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def compact(number):
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"""Convert the number to the minimal representation. This strips
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surrounding whitespace and separation dash."""
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return clean(number, '.,- ').upper().strip()
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def calc_check_digit(number):
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"""Calculate the check digit. The number passed should not have the
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check digit included."""
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weights = (3, 7, 13, 17, 19, 23, 29, 37, 41, 43, 47, 53, 59, 67, 71)
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s = sum(w * int(n) for w, n in zip(weights, reversed(number))) % 11
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return '01987654321'[s]
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def validate(number):
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"""Checks to see if the number provided is a valid number. This checks
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the length, formatting and check digit."""
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number = compact(number)
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if not 8 <= len(number) <= 16:
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raise InvalidLength()
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if not number.isdigit():
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raise InvalidFormat()
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if calc_check_digit(number[:-1]) != number[-1]:
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raise InvalidChecksum()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid number. This
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checks the length, formatting and check digit."""
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try:
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return bool(validate(number))
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except ValidationError:
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return False
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def format(number):
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"""Reformat the passed number to the standard format."""
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number = compact(number)
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return '.'.join(
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number[i - 3:i] for i in reversed(range(-1, -len(number), -3))
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) + '-' + number[-1]
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