73 lines
2.3 KiB
Python
73 lines
2.3 KiB
Python
# iban.py - functions for handling Montenegro IBANs
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# coding: utf-8
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#
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# Copyright (C) 2018 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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"""Montenegro IBAN (International Bank Account Number).
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The IBAN is used to identify bank accounts across national borders. The
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Montenegro IBAN is built up of the IBAN prefix (ME) and check digits,
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followed by a 3 digit bank identifier, a 13 digit account number and 2 more
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check digits.
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>>> validate('ME 2551 0000 0000 0623 4133')
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'ME25510000000006234133'
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>>> validate('ME52510000000006234132') # incorrect national check digits
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('GR1601101050000010547023795') # not a Montenegro IBAN
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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"""
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from __future__ import annotations
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from stdnum import iban
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from stdnum.exceptions import *
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__all__ = ['compact', 'format', 'validate', 'is_valid']
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compact = iban.compact
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format = iban.format
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def _checksum(number: str) -> int:
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"""Calculate the check digits over the provided part of the number."""
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return int(number) % 97
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def validate(number: str) -> str:
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"""Check if the number provided is a valid Montenegro IBAN."""
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number = iban.validate(number, check_country=False)
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if not number.startswith('ME'):
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raise InvalidComponent()
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if _checksum(number[4:]) != 1:
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raise InvalidChecksum()
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return number
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def is_valid(number: str) -> bool:
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"""Check if the number provided is a valid Montenegro IBAN."""
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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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