Validating VAT EEC numbers

Description

tva.py provides a function validating VAT EEC numbers

Source

The source is located in pimentech libcommonPython package: http://www.pimentech.fr/en/technologies/outils , you can also download it here: ftp://ftp.pimentech.net/src/libcommonPython/src/python/libcommon/tva.py

""" 
   Copyright (C) 2008 PimenTech SARL (http://www.pimentech.fr)

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  
"""

from string import *
import re

tva_regexps = {
	'DE' : r'\d{9}$',
	'AT' : r'U\d{8}$',
	'BE' : r'0\d{9,10}$',
	'BG' : r'\d{9}$',
	'CY' : r'\d{8}[A-Za-z]$',
	'DK' : r'\d{8}$',
	'ES' : r'\w{9}$',
	'EE' : r'\d{9}$',
	'FI' : r'\d{8}$',
	'FR' : r'\d{11}$',
	'EL' : r'\d{9}$',
	'HU' : r'\d{8}$',
	'IE' : r'\w{8}$',
	'IT' : r'\d{11}$',
	'LV' : r'\d{11}$',
	'LT' : r'\d{9}$|\d{12}$',
	'LU' : r'\d{8}$',
	'MT' : r'\d{8}$',
	'NL' : r'\w{12}$',
	'PL' : r'\d{10}$',
	'PT' : r'\d{9}$',
	'SK' : r'\d{10}$',
	'CZ' : r'\d{8,10}$',
	'RO' : r'\d{2,10}$',
	'GB' : r'\w{5}$|\w{9}$|\w{12}$',
	'SI' : r'\d{8}$',
	'SE' : r'\d{12}$'
}

tva_compiled_regexps = {}
for (country, regexp) in tva_regexps.items():
	tva_compiled_regexps[country] = re.compile(regexp)
	
def is_valid_tva(tva):
	try:
		country = upper(tva[:2])
		return tva_compiled_regexps[country].match(tva[2:])
	except:
		return False