104 lines
2.9 KiB
Python
104 lines
2.9 KiB
Python
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# ruc.py - functions for handling Paraguay RUC numbers
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# coding: utf-8
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#
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# Copyright (C) 2019 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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"""RUC number (Registro Único de Contribuyentes, Paraguay tax number).
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The Registro Único del Contribuyente (RUC) is the unique taxpayer registry
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that maintains identification numbers for all persons (national or foreign)
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and legal entities in Paraguay.
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The RUC number for legal entities consists of 8 digits starting after
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80000000. Number for residents and foreigners are up to 9 digits. The last
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digit is a check digit.
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More information:
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* https://www.ruc.com.py/
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>>> validate('80028061-0')
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'800280610'
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>>> validate('9991603')
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'9991603'
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>>> validate('2660-3')
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'26603'
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>>> validate('800532492')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('80123456789')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format('800000358')
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'80000035-8'
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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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This strips the number of any valid separators and removes surrounding
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whitespace.
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"""
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return clean(number, ' -').upper().strip()
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit.
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The number passed should not have the check digit included.
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"""
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s = sum((i + 2) * int(n) for i, n in enumerate(reversed(number)))
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return str((-s % 11) % 10)
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def validate(number: str) -> str:
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"""Check if the number is a valid Paraguay RUC 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) > 9:
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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[:-1]):
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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 Paraguay RUC 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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number = compact(number)
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return '-'.join([number[:-1], number[-1]])
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