python-stdnum commit: r139 - in python-stdnum: . stdnum stdnum/mt tests

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

Author: arthur
Date: Sat Feb 18 14:54:11 2012
New Revision: 139
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=139&view=revision

Log:
add a VAT (Maltese VAT number) module

Added:
   python-stdnum/stdnum/mt/
   python-stdnum/stdnum/mt/__init__.py
   python-stdnum/stdnum/mt/vat.py
Modified:
   python-stdnum/README
   python-stdnum/stdnum/__init__.py
   python-stdnum/tests/test_robustness.doctest

Modified: python-stdnum/README
==============================================================================
--- python-stdnum/README        Fri Feb 17 23:24:17 2012        (r138)
+++ python-stdnum/README        Sat Feb 18 14:54:11 2012        (r139)
@@ -52,6 +52,7 @@
  * PVM (Pridėtinės vertės mokestis mokėtojo kodas, Lithuanian VAT number)
  * TVA (Numéro d'identification à la taxe sur la valeur ajoutée, French
    VAT number)
+ * VAT (Maltese 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    Fri Feb 17 23:24:17 2012        (r138)
+++ python-stdnum/stdnum/__init__.py    Sat Feb 18 14:54:11 2012        (r139)
@@ -66,6 +66,7 @@
  * PVM (Pridėtinės vertės mokestis mokėtojo kodas, Lithuanian VAT number)
  * TVA (Numéro d'identification à la taxe sur la valeur ajoutée, French
    VAT number)
+ * VAT (Maltese VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

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

Added: python-stdnum/stdnum/mt/vat.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/mt/vat.py      Sat Feb 18 14:54:11 2012        (r139)
@@ -0,0 +1,59 @@
+# vat.py - functions for handling Maltese VAT 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 Maltese VAT numbers.
+
+The Maltese VAT registration number contains 8 digits and uses a simple
+weigted checksum.
+
+>>> compact('MT 1167-9112')
+'11679112'
+>>> is_valid('1167-9112')
+True
+>>> is_valid('1167-9113')  # invalid check digits
+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('MT'):
+        number = number[2:]
+    return number
+
+
+def checksum(number):
+    """Calculate the checksum."""
+    weights = (3, 4, 6, 7, 8, 9, 10, 1)
+    return sum(weights[i] * int(n) for i, n in enumerate(number)) % 37
+
+
+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 number.isdigit() and len(number) == 8 and \
+           number[0] != '0' and checksum(number) == 0

Modified: python-stdnum/tests/test_robustness.doctest
==============================================================================
--- python-stdnum/tests/test_robustness.doctest Fri Feb 17 23:24:17 2012        
(r138)
+++ python-stdnum/tests/test_robustness.doctest Sat Feb 18 14:54:11 2012        
(r139)
@@ -45,6 +45,7 @@
 >>> from stdnum.lt import pvm
 >>> from stdnum.lu import tva as lu_tva
 >>> from stdnum.lv import pvn
+>>> from stdnum.mt import vat as mt_vat
 >>> from stdnum.nl import bsn, onderwijsnummer, btw
 >>> from stdnum.pt import nif as pt_nif
 >>> from stdnum.ro import cf, cnp
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