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# cpf.py - functions for handling CPF numbers
# coding: utf-8
#
# Copyright (C) 2011 Arthur de Jong
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""Module for handling CPF (Cadastro de Pessoas Físicas) numbers, the
Brazillian national identification number.
>>> is_valid('390.533.447-05')
True
>>> is_valid('231.002.999-00')
False
>>> compact('390.533.447-05')
'39053344705'
>>> format('23100299900')
'231.002.999-00'
"""
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
number = number.replace(' ','').replace('-','').replace('.','').strip()
# pad with leading zeroes
return number
def _calc_check_digits(number):
"""Calculate the check digits for the number."""
d1 = sum( (10-i) * int(number[i]) for i in range(9) )
d1 = ( 11 - d1 ) % 11 % 10
d2 = sum( (11-i) * int(number[i]) for i in range(9) ) + 2 * d1
d2 = ( 11 - d2 ) % 11 % 10
return '%d%d' % (d1, d2)
def is_valid(number):
"""Checks to see if the number provided is a valid BSN. This checks
the length and whether the check digit is correct."""
try:
number = compact(number)
except:
return False
return len(number) == 11 and \
number.isdigit() and \
int(number) > 0 and \
_calc_check_digits(number) == number[-2:]
def format(number):
"""Reformat the passed number to the standard format."""
number = compact(number)
return number[:3] + '.' + number[3:6] + '.' + number[6:-2] + '-' + number[-2:]
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