python-stdnum commit: r119 - in python-stdnum: . stdnum stdnum/dk tests

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

Author: arthur
Date: Sat Feb 11 21:26:46 2012
New Revision: 119
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=119&view=revision

Log:
add a CVR (Momsregistreringsnummer, Danish VAT number) module

Added:
   python-stdnum/stdnum/dk/
   python-stdnum/stdnum/dk/__init__.py
   python-stdnum/stdnum/dk/cvr.py
Modified:
   python-stdnum/README
   python-stdnum/stdnum/__init__.py
   python-stdnum/tests/test_robustness.doctest

Modified: python-stdnum/README
==============================================================================
--- python-stdnum/README        Sat Feb 11 21:25:18 2012        (r118)
+++ python-stdnum/README        Sat Feb 11 21:26:46 2012        (r119)
@@ -34,6 +34,7 @@
  * Ust ID Nr. (Umsatzsteur Identifikationnummer, the German VAT number)
  * BTW, TVA, NWSt (Belgian VAT number)
  * PVN (Pievienotās vērtības nodokļa, Latvian VAT number)
+ * CVR (Momsregistreringsnummer, Danish VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

Modified: python-stdnum/stdnum/__init__.py
==============================================================================
--- python-stdnum/stdnum/__init__.py    Sat Feb 11 21:25:18 2012        (r118)
+++ python-stdnum/stdnum/__init__.py    Sat Feb 11 21:26:46 2012        (r119)
@@ -48,6 +48,7 @@
  * Ust ID Nr. (Umsatzsteur Identifikationnummer, the German VAT number)
  * BTW, TVA, NWSt (Belgian VAT number)
  * PVN (Pievienotās vērtības nodokļa, Latvian VAT number)
+ * CVR (Momsregistreringsnummer, Danish VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

Added: python-stdnum/stdnum/dk/__init__.py
==============================================================================

Added: python-stdnum/stdnum/dk/cvr.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/dk/cvr.py      Sat Feb 11 21:26:46 2012        (r119)
@@ -0,0 +1,59 @@
+# cvr.py - functions for handling Danish CVR 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 CVR (Momsregistreringsnummer, VAT) numbers.
+
+It is an 8 digit number with a straightforward check mechanism.
+
+>>> compact('DK 13585628')
+'13585628'
+>>> is_valid('DK 13585628')
+True
+>>> is_valid('DK 13585627')
+False
+"""
+
+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."""
+    number = clean(number, ' -.,/:').upper().strip()
+    if number.startswith('DK'):
+        number = number[2:]
+    return number
+
+
+def checksum(number):
+    """Calculate the checksum."""
+    weights = (2, 7, 6, 5, 4, 3, 2, 1)
+    return sum(weights[i] * int(n) for i, n in enumerate(number)) % 11
+
+
+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
+    return len(number) == 8 and number.isdigit() and \
+           number[0] != '0' and checksum(number) == 0

Modified: python-stdnum/tests/test_robustness.doctest
==============================================================================
--- python-stdnum/tests/test_robustness.doctest Sat Feb 11 21:25:18 2012        
(r118)
+++ python-stdnum/tests/test_robustness.doctest Sat Feb 11 21:26:46 2012        
(r119)
@@ -30,6 +30,7 @@
 >>> from stdnum.br import cpf
 >>> from stdnum.cz import rc
 >>> from stdnum.de import vat as de_vat
+>>> from stdnum.dk import cvr
 >>> from stdnum.es import cif, dni, nie, nif
 >>> from stdnum.fi import hetu
 >>> from stdnum.fr import siren
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