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# cuit.py - functions for handling Argentinian VAT numbers
# coding: utf-8
#
# Copyright (C) 2009 Mariano Reingart
# Copyright (C) 2011 Sebastián Marró
# Copyright (C) 2008-2011 Cédric Krier
# Copyright (C) 2008-2011 B2CK
# Copyright (C) 2015 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""CUIT (Código Único de Identificación Tributaria, Argentinian tax number).
The CUIT is a taxpayer identification number used for VAT (IVA, Impuesto al
Valor Agregado) and other taxes.
More information:
* https://es.wikipedia.org/wiki/Clave_Única_de_Identificación_Tributaria
>>> validate('20-05536168-2')
'20055361682'
>>> validate('20267565392')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('20267565393')
'20-26756539-3'
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' -').strip()
def calc_check_digit(number):
"""Calculate the check digit."""
weights = (5, 4, 3, 2, 7, 6, 5, 4, 3, 2)
check = sum(w * int(n) for w, n in zip(weights, number)) % 11
return '012345678990'[11 - check]
# The different types of CUIT that are known
_cuit_tpes = (
'20', '23', '24', '27', # individuals
'30', '33', '34', # companies
'50', '51', '55', # international purposes
)
def validate(number):
"""Check if the number is a valid CUIT."""
number = compact(number)
if len(number) != 11:
raise InvalidLength()
if not isdigits(number):
raise InvalidFormat()
if number[:2] not in _cuit_tpes:
raise InvalidComponent()
if calc_check_digit(number[:-1]) != number[-1]:
raise InvalidChecksum()
return number
def is_valid(number):
"""Check if the number is a valid CUIT."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
number = compact(number)
return (number[0:2] + '-' + number[2:10] + '-' + number[10:])
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