121 lines
3.6 KiB
Python
121 lines
3.6 KiB
Python
# pesel.py - functions for handling Polish national identification numbers
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# coding: utf-8
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#
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# Copyright (C) 2015 Dariusz Choruzy
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# Copyright (C) 2015 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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"""PESEL (Polish national identification number).
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The Powszechny Elektroniczny System Ewidencji LudnoĊci (PESEL, Universal
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Electronic System for Registration of the Population) is a 11-digit Polish
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national identification number. The number consists of the date of birth,
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a serial number, the person's gender and a check digit.
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>>> validate('44051401359')
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'44051401359'
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>>> validate('44051401358') # incorrect check digit
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('02381307589') # invalid birth date
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> get_birth_date('02122401358')
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datetime.date(1902, 12, 24)
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>>> get_gender('02122401358')
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'M'
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>>> get_birth_date('02211307589')
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datetime.date(2002, 1, 13)
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>>> get_gender('02211307589')
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'F'
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"""
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import datetime
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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, ' -').upper().strip()
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def get_birth_date(number):
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"""Split the date parts from the number and return the birth date."""
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number = compact(number)
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year = int(number[0:2])
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month = int(number[2:4])
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day = int(number[4:6])
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year += {
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0: 1900,
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1: 2000,
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2: 2100,
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3: 2200,
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4: 1800,
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}[month // 20]
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month = month % 20
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try:
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return datetime.date(year, month, day)
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except ValueError:
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raise InvalidComponent()
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def get_gender(number):
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"""Get the person's birth gender ('M' or 'F')."""
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number = compact(number)
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if number[9] in '02468': # even
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return 'F'
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else: # odd: 13579
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return 'M'
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def calc_check_digit(number):
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"""Calculate the check digit for organisations. The number passed
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should not have the check digit included."""
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weights = (1, 3, 7, 9, 1, 3, 7, 9, 1, 3)
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check = sum(w * int(n) for w, n in zip(weights, number))
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return str((10 - check) % 10)
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def validate(number):
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"""Checks to see if the number provided is a valid
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national identification number. This checks the length,
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formatting and check digit."""
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number = compact(number)
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if not number.isdigit():
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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 number[-1] != calc_check_digit(number[:-1]):
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raise InvalidChecksum()
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get_birth_date(number)
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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
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national identification number. This checks the length,
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formatting and check digit."""
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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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