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| author | Arthur de Jong <arthur@arthurdejong.org> | 2012-02-10 14:06:31 +0100 |
|---|---|---|
| committer | Arthur de Jong <arthur@arthurdejong.org> | 2012-02-10 14:06:31 +0100 |
| commit | 473b3cab02927707d11adb6f24e3c2c753ea2036 (patch) | |
| tree | 35fa60487c96a71b7a001e0760087724bc3a4077 /stdnum/gr/vat.py | |
| parent | 9f1d47b3ca49227fa5316066f264ab61cccdb03c (diff) | |
add a FPA, ΦΠΑ (Foros Prostithemenis Aksias, the Greek VAT number) module
git-svn-id: http://arthurdejong.org/svn/python-stdnum/python-stdnum@103 9dea7c4f-944c-4273-ac1a-574ede026edc
Diffstat (limited to 'stdnum/gr/vat.py')
| -rw-r--r-- | stdnum/gr/vat.py | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/stdnum/gr/vat.py b/stdnum/gr/vat.py new file mode 100644 index 0000000..e37fe95 --- /dev/null +++ b/stdnum/gr/vat.py @@ -0,0 +1,63 @@ +# vat.py - functions for handling Greek 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 Greek VAT (Foros Prostithemenis Aksias, FPA, ΦΠΑ) +numbers. + +>>> compact('GR 23456783') +'023456783' +>>> is_valid('EL 094259216 ') +True +>>> is_valid('EL 123456781') +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('EL') or number.startswith('GR'): + number = number[2:] + if len(number) == 8: + number = '0' + number # old format had 8 digits + return number + + +def calc_check_digit(number): + """Calculate the check digit. The number passed should not have the + check digit included.""" + checksum = 0 + for n in number: + checksum = checksum * 2 + int(n) + return str(checksum * 2 % 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 + return len(number) == 9 and number.isdigit() and \ + calc_check_digit(number[:-1]) == number[-1] |