python-stdnum commit: r132 - in python-stdnum: . stdnum stdnum/cz tests

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

Author: arthur
Date: Fri Feb 17 16:36:45 2012
New Revision: 132
URL: http://arthurdejong.org/viewvc/python-stdnum?revision=132&view=revision

Log:
add a DIČ (Daňové identifikační číslo, Czech VAT number) module

Added:
   python-stdnum/stdnum/cz/dic.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 16:15:17 2012        (r131)
+++ python-stdnum/README        Fri Feb 17 16:36:45 2012        (r132)
@@ -45,6 +45,7 @@
  * NIF (Número de identificação fiscal, Portuguese VAT number)
  * IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty, Slovak VAT number)
  * ALV nro (Arvonlisäveronumero, Finnish VAT number)
+ * DIČ (Daňové identifikační číslo, Czech 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 16:15:17 2012        (r131)
+++ python-stdnum/stdnum/__init__.py    Fri Feb 17 16:36:45 2012        (r132)
@@ -59,6 +59,7 @@
  * NIF (Número de identificação fiscal, Portuguese VAT number)
  * IČ DPH (Identifikačné číslo pre daň z pridanej hodnoty, Slovak VAT number)
  * ALV nro (Arvonlisäveronumero, Finnish VAT number)
+ * DIČ (Daňové identifikační číslo, Czech VAT number)
  * IMEI (International Mobile Equipment Identity)
  * IMSI (International Mobile Subscriber Identity)
  * MEID (Mobile Equipment Identifier)

Added: python-stdnum/stdnum/cz/dic.py
==============================================================================
--- /dev/null   00:00:00 1970   (empty, because file is newly added)
+++ python-stdnum/stdnum/cz/dic.py      Fri Feb 17 16:36:45 2012        (r132)
@@ -0,0 +1,86 @@
+# dic.py - functions for handling Czech 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 Czech DIČ (Daňové identifikační číslo, VAT) numbers.
+
+It is an 8, 9 or 10 digit code that includes a check digit and is used to
+uniquely identify taxpayers for VAT (DPH in Czech). The number can refer
+to legal entities (8 digit numbers), individuals with a RČ (the 9 or 10
+digit Czech birth number) or individuals without a RČ (9 digit numbers
+that begin with a 6).
+
+>>> compact('CZ 25123891')
+'25123891'
+>>> is_valid('25123891')  # legal entity
+True
+>>> is_valid('25123890')  # incorrect check digit
+False
+>>> is_valid('7103192745')  # RČ
+True
+>>> is_valid('640903926')  # special case
+True
+"""
+
+from stdnum.cz import rc
+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('CZ'):
+        number = number[2:]
+    return number
+
+
+def calc_check_digit_legal(number):
+    """Calculate the check digit for 8 digit legal entities. The number
+    passed should not have the check digit included."""
+    check = (11 - sum((8 - i) * int(n) for i, n in enumerate(number))) % 11
+    return str((check or 1) % 10)
+
+
+def calc_check_digit_special(number):
+    """Calculate the check digit for special cases. The number passed
+    should not have the first and last digits included."""
+    check = (11 - sum((8 - i) * int(n) for i, n in enumerate(number))) % 11
+    return str(9 - check % 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) == 8 and not number.startswith('9'):
+        # legal entities
+        return calc_check_digit_legal(number[:-1]) == number[-1]
+    if len(number) == 9 and number.startswith('6'):
+        # special cases (skip first digit in calculation)
+        return calc_check_digit_special(number[1:-1]) == number[-1]
+    if len(number) in (9, 10):
+        # 9 or 10 digit individual
+        return rc.is_valid(number)
+    return False

Modified: python-stdnum/tests/test_robustness.doctest
==============================================================================
--- python-stdnum/tests/test_robustness.doctest Fri Feb 17 16:15:17 2012        
(r131)
+++ python-stdnum/tests/test_robustness.doctest Fri Feb 17 16:36:45 2012        
(r132)
@@ -30,7 +30,7 @@
 >>> from stdnum.be import vat as be_vat
 >>> from stdnum.br import cpf
 >>> from stdnum.cy import vat as cy_vat
->>> from stdnum.cz import rc
+>>> from stdnum.cz import dic, rc
 >>> from stdnum.de import vat as de_vat
 >>> from stdnum.dk import cvr
 >>> from stdnum.es import cif, dni, nie, nif as es_nif
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