python-stdnum commit: r136 - in python-stdnum: . stdnum stdnum/lt tests

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

Author: arthur
Date: Fri Feb 17 17:27:34 2012
New Revision: 136
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=136&view=revision

Log:
add a PVM (Pridėtinės vertės mokestis mokėtojo kodas, Lithuanian VAT number) 
module

Added:
   python-stdnum/stdnum/lt/
   python-stdnum/stdnum/lt/__init__.py
   python-stdnum/stdnum/lt/pvm.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 17:15:53 2012        (r135)
+++ python-stdnum/README        Fri Feb 17 17:27:34 2012        (r136)
@@ -49,6 +49,7 @@
  * VAT (Irish VAT number)
  * ANUM (Közösségi adószám, Hungarian VAT number)
  * KMKR (Käibemaksukohuslase, Estonian VAT number)
+ * PVM (Pridėtinės vertės mokestis mokėtojo kodas, Lithuanian 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 17:15:53 2012        (r135)
+++ python-stdnum/stdnum/__init__.py    Fri Feb 17 17:27:34 2012        (r136)
@@ -63,6 +63,7 @@
  * VAT (Irish VAT number)
  * ANUM (Közösségi adószám, Hungarian VAT number)
  * KMKR (Käibemaksukohuslase, Estonian VAT number)
+ * PVM (Pridėtinės vertės mokestis mokėtojo kodas, Lithuanian VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

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

Added: python-stdnum/stdnum/lt/pvm.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/lt/pvm.py      Fri Feb 17 17:27:34 2012        (r136)
@@ -0,0 +1,77 @@
+# pvm.py - functions for handling Lithuanian VAT numbers
+# coding: utf-8
+#
+# 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 Lithuanian PVM (Pridėtinės vertės mokestis mokėtojo
+kodas, VAT) numbers.
+
+The number is 9 (for legal entities) or 12 digits long (for temporarily
+registered taxpayers). This module does not check the format of Lithuanian
+personal codes (Asmens kodas).
+
+>>> compact('LT 100001919017')
+'100001919017'
+>>> is_valid('119511515')  # organisation
+True
+>>> is_valid('100001919017')  # temporarily registered
+True
+>>> is_valid('100001919018')  # invalid check digit
+False
+>>> is_valid('100004801610')  # second step in check digit calculation
+True
+"""
+
+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('LT'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digit(number):
+    """Calculate the check digit. The number passed should not have the
+    check digit included."""
+    check = sum((1 + i % 9) * int(n) for i, n in enumerate(number)) % 11
+    if check == 10:
+        check = sum((1 + (i + 2) % 9) * int(n) for i, n in enumerate(number))
+    return str(check % 11 % 10)
+
+
+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():
+        return False
+    if len(number) == 9:
+        # legal entities
+        return number[7] == '1' and \
+               calc_check_digit(number[:-1]) == number[-1]
+    if len(number) == 12:
+        # temporary tax payers and natural persons
+        return number[10] == '1' and \
+               calc_check_digit(number[:-1]) == number[-1]

Modified: python-stdnum/tests/test_robustness.doctest
==============================================================================
--- python-stdnum/tests/test_robustness.doctest Fri Feb 17 17:15:53 2012        
(r135)
+++ python-stdnum/tests/test_robustness.doctest Fri Feb 17 17:27:34 2012        
(r136)
@@ -42,6 +42,7 @@
 >>> from stdnum.ie import vat as ie_vat
 >>> from stdnum.iso7064 import mod_11_10, mod_11_2, mod_37_2, mod_37_36, 
 >>> mod_97_10
 >>> from stdnum.it import iva
+>>> from stdnum.lt import pvm
 >>> from stdnum.lu import tva
 >>> from stdnum.lv import pvn
 >>> from stdnum.nl import bsn, onderwijsnummer, btw
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