96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
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# pesel.py - functions for handling REGON numbers
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# coding: utf-8
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#
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# Copyright (C) 2015 Dariusz Choruzy
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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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"""REGON (Rejestr Gospodarki Narodowej, Polish register of economic units).
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The REGON (Rejestr Gospodarki Narodowej) is a statistical identification
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number for businesses. National entities are assigned a 9-digit number, while
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local units append 5 digits to form a 14-digit number.
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More information can be found at:
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http://bip.stat.gov.pl/en/regon/
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http://www.stat.gov.pl/bip/regon_ENG_HTML.htm
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https://wyszukiwarkaregon.stat.gov.pl/appBIR/index.aspx
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>>> validate('192598184')
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'192598184'
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>>> validate('123456785')
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'123456785'
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>>> validate('192598183')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('12345678512347')
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'12345678512347'
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>>> validate('12345678612342') # first check digit invalid
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('12345678512348') # last check digit invalid
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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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 the
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number of any valid separators and removes surrounding whitespace."""
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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 for organisations. The number passed
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should not have the check digit included."""
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if len(number) == 8:
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weights = (8, 9, 2, 3, 4, 5, 6, 7)
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else:
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weights = (2, 4, 8, 5, 0, 9, 7, 3, 6, 1, 2, 4, 8)
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check = sum(w * int(n) for w, n in zip(weights, number))
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return str(check % 11 % 10)
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def validate(number):
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"""Checks to see if the number provided is a valid REGON number. This
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checks the length, formatting and check digit."""
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number = compact(number)
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if not number.isdigit():
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raise InvalidFormat()
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if len(number) not in (9, 14):
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raise InvalidLength()
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if number[-1] != calc_check_digit(number[:-1]):
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raise InvalidChecksum()
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if len(number) == 14 and number[8] != calc_check_digit(number[:8]):
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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 REGON 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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