80 lines
2.6 KiB
Python
80 lines
2.6 KiB
Python
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# vat.py - functions for handling Swiss VAT numbers
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# coding: utf-8
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#
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# Copyright (C) 2015 Arthur de Jong
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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"""VAT, MWST, TVA, IVA, TPV (Mehrwertsteuernummer, the Swiss VAT number).
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The Swiss VAT number is based on the UID but is followed by either "MWST"
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(Mehrwertsteuer, the German abbreviation for VAT), "TVA" (Taxe sur la valeur
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ajoutée in French), "IVA" (Imposta sul valore aggiunto in Italian) or "TPV"
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(Taglia sin la plivalur in Romanian).
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This module only supports the "new" format that was introduced in 2011 which
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completely replaced the "old" 6-digit format in 2014.
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More information is available at:
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https://www.ch.ch/en/value-added-tax-number-und-business-identification-number/
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https://www.uid.admin.ch/
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>>> validate('CHE-107.787.577 IVA')
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'CHE107787577IVA'
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>>> validate('CHE-107.787.578 IVA')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> format('CHE107787577IVA')
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'CHE-107.787.577 IVA'
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"""
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from stdnum.exceptions import *
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from stdnum.ch import uid
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def compact(number):
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"""Convert the number to the minimal representation. This strips
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surrounding whitespace and separators."""
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return uid.compact(number)
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def validate(number):
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"""Checks to see if the number provided is a valid number. This checks
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the length, formatting and check digit."""
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number = compact(number)
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if len(number) not in (15, 16):
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raise InvalidLength()
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uid.validate(number[:12])
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if number[12:] not in ('MWST', 'TVA', 'IVA', 'TPV'):
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raise InvalidComponent()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid number. This checks
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the length, formatting and check digit."""
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try:
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return bool(validate(number))
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except ValidationError:
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return False
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def format(number):
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"""Reformat the passed number to the standard format."""
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number = compact(number)
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return uid.format(number[:12]) + ' ' + number[12:]
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