82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
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# cpf.py - functions for handling CPF numbers
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# coding: utf-8
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#
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# Copyright (C) 2011, 2012, 2013 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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"""CPF (Cadastro de Pessoas Físicas, Brazillian national identifier).
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>>> validate('390.533.447-05')
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'39053344705'
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>>> validate('231.002.999-00')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('390.533.447=0') # invalid delimiter
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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>>> format('23100299900')
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'231.002.999-00'
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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, ' -.').strip()
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def _calc_check_digits(number):
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"""Calculate the check digits for the number."""
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d1 = sum((10 - i) * int(number[i]) for i in range(9))
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d1 = (11 - d1) % 11 % 10
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d2 = sum((11 - i) * int(number[i]) for i in range(9)) + 2 * d1
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d2 = (11 - d2) % 11 % 10
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return '%d%d' % (d1, d2)
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def validate(number):
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"""Checks to see if the number provided is a valid CPF. This checks
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the length and whether the check digit is correct."""
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number = compact(number)
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if not number.isdigit() or int(number) <= 0:
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raise InvalidFormat()
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if len(number) != 11:
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raise InvalidLength()
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if _calc_check_digits(number) != number[-2:]:
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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 CPF. This checks
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the length and whether the check digit is correct."""
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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):
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"""Reformat the passed number to the standard format."""
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number = compact(number)
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return number[:3] + '.' + number[3:6] + '.' + number[6:-2] + '-' + number[-2:]
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