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