64 lines
2 KiB
Python
64 lines
2 KiB
Python
# ytunnus.py - functions for handling Finnish business identifiers (y-tunnus)
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# coding: utf-8
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#
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# Copyright (C) 2015 Holvi Payment Services Oy
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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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"""Y-tunnus (Finnish business identifier).
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The number is an 8-digit code with a weighted checksum.
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>>> validate('2077474-0')
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'20774740'
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>>> validate('2077474-1') # invalid check digit
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> format('2077474-0')
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'2077474-0'
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"""
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from stdnum.exceptions import *
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from stdnum.fi import alv
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def compact(number):
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"""Convert the number to the minimal representation. This strips the
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number of any valid separators and removes surrounding whitespace."""
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return alv.compact(number)
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def validate(number):
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"""Checks to see if the number provided is a valid business identifier.
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This checks the length, formatting and check digit."""
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return alv.validate(number)
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def is_valid(number):
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"""Checks to see if the number provided is a valid business identifier.
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This checks 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 number[:7] + '-' + number[7:]
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