python-stdnum commit: r161 - in python-stdnum: . stdnum stdnum/dk

[Commits of the python-stdnum project <python-stdnum-commits [at] lists.arthurdejong.org>]

Author: arthur
Date: Thu Feb 23 23:25:03 2012
New Revision: 161
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=161&view=revision

Log:
add a CPR (personnummer, the Danish citizen number) module

Added:
   python-stdnum/stdnum/dk/cpr.py
Modified:
   python-stdnum/README
   python-stdnum/stdnum/__init__.py

Modified: python-stdnum/README
==============================================================================
--- python-stdnum/README        Thu Feb 23 22:58:18 2012        (r160)
+++ python-stdnum/README        Thu Feb 23 23:25:03 2012        (r161)
@@ -34,6 +34,7 @@
  * PNF (ЛНЧ, Личен номер на чужденец, Bulgarian personal number of a foreigner)
  * OIB (Osobni identifikacijski broj, Croatian personal identification number)
  * PPS No (Personal Public Service Number, Irish personal number)
+ * CPR (personnummer, the Danish citizen number)
  * NIF (Número de Identificación Fiscal, Spanish VAT number)
  * FPA, ΦΠΑ (Foros Prostithemenis Aksias, the Greek VAT number)
  * Ust ID Nr. (Umsatzsteur Identifikationnummer, the German VAT number)

Modified: python-stdnum/stdnum/__init__.py
==============================================================================
--- python-stdnum/stdnum/__init__.py    Thu Feb 23 22:58:18 2012        (r160)
+++ python-stdnum/stdnum/__init__.py    Thu Feb 23 23:25:03 2012        (r161)
@@ -48,6 +48,7 @@
  * PNF (ЛНЧ, Личен номер на чужденец, Bulgarian personal number of a foreigner)
  * OIB (Osobni identifikacijski broj, Croatian personal identification number)
  * PPS No (Personal Public Service Number, Irish personal number)
+ * CPR (personnummer, the Danish citizen number)
  * NIF (Número de Identificación Fiscal, Spanish VAT number)
  * FPA, ΦΠΑ (Foros Prostithemenis Aksias, the Greek VAT number)
  * Ust ID Nr. (Umsatzsteur Identifikationnummer, the German VAT number)

Added: python-stdnum/stdnum/dk/cpr.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/dk/cpr.py      Thu Feb 23 23:25:03 2012        (r161)
@@ -0,0 +1,99 @@
+# cpr.py - functions for handling Danish CPR numbers
+#
+# Copyright (C) 2012 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 Danish CPR-number (or personnummer, the Danish
+citizen number).
+
+The number consists of 10 digits in the format DDMMYY-SSSS where the first
+part represents the birth date and the second a sequence number. The first
+digit of the sequence number indicates the century.
+
+The numbers used to validate using a checksum but since the sequence
+numbers ran out this was abandoned in 2007.
+
+>>> compact('211062-5629')
+'2110625629'
+>>> is_valid('211062-5629')
+True
+>>> checksum('2110625629')
+0
+>>> is_valid('511062-5629')  # invalid date
+False
+>>> get_birth_date('2110620629')
+datetime.date(1962, 10, 21)
+>>> get_birth_date('2110525629')
+datetime.date(2052, 10, 21)
+>>> format('2110625629')
+'211062-5629'
+"""
+
+import datetime
+
+from stdnum.util import clean
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    return clean(number, ' -').strip()
+
+
+def checksum(number):
+    """Calculate the checksum. Note that the checksum isn't actually used
+    any more."""
+    weights = (4, 3, 2, 7, 6, 5, 4, 3, 2, 1)
+    return sum(weights[i] * int(n) for i, n in enumerate(number)) % 11
+
+
+def get_birth_date(number):
+    """Split the date parts from the number and return the birth date."""
+    day = int(number[0:2])
+    month = int(number[2:4])
+    year = int(number[4:6])
+    if number[6] in '5678' and year >= 58:
+        year += 1800
+    elif number[6] in '0123' or (number[6] in '49' and year >= 37):
+        year += 1900
+    else:
+        year += 2000
+    return datetime.date(year, month, day)
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid VAT number. This checks
+    the length, formatting and check digit."""
+    try:
+        number = compact(number)
+    except:
+        return False
+    if not number.isdigit() or len(number) != 10:
+        return False
+    # check if birth date is valid
+    try:
+        birth_date = get_birth_date(number)
+        # TODO: check that the birth date is not in the future
+    except ValueError, e:
+        return False
+    return True
+
+
+def format(number):
+    """Reformat the passed number to the standard format."""
+    number = compact(number)
+    return '-'.join((number[:6], number[6:]))
-- 
To unsubscribe send an email to
python-stdnum-commits-unsubscribe@lists.arthurdejong.org or see
http://lists.arthurdejong.org/python-stdnum-commits/