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# siret.py - functions for handling French SIRET numbers
# coding: utf-8
#
# Copyright (C) 2016 Yoann Aubineau
#
# 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
"""SIRET (a French company establishment identification number).
The SIRET (Système d'Identification du Répertoire des ETablissements)
is a 14 digit number used to identify French companies' establishments
and facilities. The Luhn checksum is used to validate the numbers (except
for La Poste).
More information:
* https://fr.wikipedia.org/wiki/Système_d'identification_du_répertoire_des_établissements
>>> validate('73282932000074')
'73282932000074'
>>> validate('73282932000079')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> to_siren('732 829 320 00074')
'732 829 320'
>>> to_siren('73282932000074')
'732829320'
>>> to_tva('732 829 320 00074')
'44 732 829 320'
>>> to_tva('73282932000074')
'44732829320'
>>> format('73282932000074')
'732 829 320 00074'
"""
from stdnum import luhn
from stdnum.exceptions import *
from stdnum.fr import siren
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 validate(number):
"""Check if the number is a valid SIRET. This checks the length,
formatting and check digit."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) != 14:
raise InvalidLength()
# La Poste SIRET (except the head office) do not use the Luhn checksum
# but the sum of digits must be a multiple of 5
if number.startswith('356000000') and number != '35600000000048':
if sum(map(int, number)) % 5 != 0:
raise InvalidChecksum()
else:
luhn.validate(number)
siren.validate(number[:9])
return number
def is_valid(number):
"""Check if the number is a valid SIRET."""
try:
return bool(validate(number))
except ValidationError:
return False
def to_siren(number):
"""Convert the SIRET number to a SIREN number.
The SIREN number is the 9 first digits of the SIRET number.
"""
_siren = []
digit_count = 0
for char in number:
if digit_count < 9:
_siren.append(char)
if isdigits(char):
digit_count += 1
return ''.join(_siren)
def to_tva(number):
"""Convert the SIRET number to a TVA number.
The TVA number is built from the SIREN number, prepended by two extra
error checking digits.
"""
return siren.to_tva(to_siren(number))
def format(number, separator=' '):
"""Reformat the number to the standard presentation format."""
number = compact(number)
return separator.join((number[0:3], number[3:6], number[6:9], number[9:]))
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