98 lines
3.1 KiB
Python
98 lines
3.1 KiB
Python
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# edrpou.py - functions for handling Ukrainian EDRPOU numbers
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# coding: utf-8
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#
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# Copyright (C) 2020 Leandro Regueiro
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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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"""ЄДРПОУ, EDRPOU (Identifier for enterprises and organizations in Ukraine).
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The ЄДРПОУ (Єдиного державного реєстру підприємств та організацій України,
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Unified State Register of Enterprises and Organizations of Ukraine) is a
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unique identification number of a legal entities in Ukraine. The number
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consists of 8 digits, the last being a check digit.
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More information:
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* https://uk.wikipedia.org/wiki/Код_ЄДРПОУ
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* https://1cinfo.com.ua/Articles/Proverka_koda_po_EDRPOU.aspx
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>>> validate('32855961')
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'32855961'
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>>> validate('32855968')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('12345')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format(' 32855961 ')
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'32855961'
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"""
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from __future__ import annotations
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from stdnum.exceptions import *
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from stdnum.util import clean, isdigits
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def compact(number: str) -> str:
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"""Convert the number to the minimal representation."""
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return clean(number, ' ').strip()
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit for number."""
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weights = [1, 2, 3, 4, 5, 6, 7]
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if number[0] in '345':
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weights = [7, 1, 2, 3, 4, 5, 6]
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total = sum(w * int(n) for w, n in zip(weights, number))
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if total % 11 < 10:
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return str(total % 11)
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# Calculate again with other weights
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weights = [w + 2 for w in weights]
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total = sum(w * int(n) for w, n in zip(weights, number))
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return str(total % 11 % 10)
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def validate(number: str) -> str:
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"""Check if the number is a valid Ukraine EDRPOU (ЄДРПОУ) number.
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This checks the length, formatting and check digit.
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"""
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number = compact(number)
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if len(number) != 8:
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raise InvalidLength()
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if not isdigits(number):
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raise InvalidFormat()
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if number[-1] != calc_check_digit(number):
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raise InvalidChecksum()
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return number
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def is_valid(number: str) -> bool:
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"""Check if the number is a valid Ukraine EDRPOU (ЄДРПОУ) number."""
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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: str) -> str:
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"""Reformat the number to the standard presentation format."""
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return compact(number)
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