python-stdnum commit: r128 - in python-stdnum: . stdnum stdnum/at tests

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

Author: arthur
Date: Mon Feb 13 23:11:22 2012
New Revision: 128
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=128&view=revision

Log:
add a UID (Umsatzsteuer-Identifikationsnummer, Austrian VAT number) module

Added:
   python-stdnum/stdnum/at/
   python-stdnum/stdnum/at/__init__.py
   python-stdnum/stdnum/at/uid.py
Modified:
   python-stdnum/README
   python-stdnum/stdnum/__init__.py
   python-stdnum/tests/test_robustness.doctest

Modified: python-stdnum/README
==============================================================================
--- python-stdnum/README        Mon Feb 13 23:02:41 2012        (r127)
+++ python-stdnum/README        Mon Feb 13 23:11:22 2012        (r128)
@@ -41,6 +41,7 @@
  * CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number)
  * Partita IVA (Italian VAT number)
  * Αριθμός Εγγραφής Φ.Π.Α. (Cypriot VAT number)
+ * UID (Umsatzsteuer-Identifikationsnummer, Austrian 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    Mon Feb 13 23:02:41 2012        (r127)
+++ python-stdnum/stdnum/__init__.py    Mon Feb 13 23:11:22 2012        (r128)
@@ -55,6 +55,7 @@
  * CF (Cod de înregistrare în scopuri de TVA, Romanian VAT number)
  * Partita IVA (Italian VAT number)
  * Αριθμός Εγγραφής Φ.Π.Α. (Cypriot VAT number)
+ * UID (Umsatzsteuer-Identifikationsnummer, Austrian VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

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

Added: python-stdnum/stdnum/at/uid.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/at/uid.py      Mon Feb 13 23:11:22 2012        (r128)
@@ -0,0 +1,64 @@
+# vat.py - functions for handling Austrian 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 Austrian UID (Umsatzsteuer-Identifikationsnummer,
+VAT) numbers.
+
+The number is a 9-digit number that always starts with a U (optionally
+preceded with AT). The last digit is a check digit.
+
+>>> compact('AT U13585627')
+'U13585627'
+>>> is_valid('U13585627')
+True
+>>> calc_check_digit('U1358562')
+'7'
+>>> is_valid('U13585626')  # incorrect check digit
+False
+"""
+
+from stdnum import luhn
+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('AT'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digit(number):
+    """Calculate the check digit. The number passed should not have the
+    check digit included."""
+    return str((6 - luhn.checksum(number[1:])) % 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
+    return len(number) == 9 and number[0] == 'U' and \
+           number[1:].isdigit() and \
+           calc_check_digit(number[:-1]) == number[-1]

Modified: python-stdnum/tests/test_robustness.doctest
==============================================================================
--- python-stdnum/tests/test_robustness.doctest Mon Feb 13 23:02:41 2012        
(r127)
+++ python-stdnum/tests/test_robustness.doctest Mon Feb 13 23:11:22 2012        
(r128)
@@ -26,6 +26,7 @@
 
 >>> from stdnum import grid, iban, imei, imsi, isan, isbn, isil, ismn, issn, 
 >>> ean
 >>> from stdnum import luhn, meid, verhoeff
+>>> from stdnum.at import uid
 >>> from stdnum.be import vat as be_vat
 >>> from stdnum.br import cpf
 >>> from stdnum.cy import vat as cy_vat
-- 
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