75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
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# dni.py - functions for handling Argentinian national identifiers
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# coding: utf-8
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#
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# Copyright (C) 2018 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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"""DNI (Documento Nacional de Identidad, Argentinian national identity nr.).
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The DNI number is the number that appears on the Argentinian national
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identity document and is used to identify citizen and foreigners residing in
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the country.
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More information:
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* https://en.wikipedia.org/wiki/Documento_Nacional_de_Identidad_(Argentina)
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>>> validate('20.123.456')
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'20123456'
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>>> validate('2012345699')
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format('20123456')
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'20.123.456'
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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. This strips the
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number of any valid separators and removes surrounding whitespace."""
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return clean(number, ' .').strip()
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def validate(number: str) -> str:
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"""Check if the number is a valid DNI."""
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number = compact(number)
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if not isdigits(number):
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raise InvalidFormat()
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if len(number) not in (7, 8):
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raise InvalidLength()
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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 DNI."""
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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[:-6], number[-6:-3], number[-3:]))
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