85 lines
2.5 KiB
Python
85 lines
2.5 KiB
Python
# postleitzahl.py - functions for handling Austrian postal codes
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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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"""Postleitzahl (Austrian postal code).
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The Austrian postal code consists of four digits that identifies a post
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office in Austria.
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More information:
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* https://en.wikipedia.org/wiki/Postal_codes_in_Austria
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* https://www.post.at/suche/standortsuche.php/index/selectedsearch/plz
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>>> validate('5090')
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'5090'
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>>> import json
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>>> print(json.dumps(info('5090'), indent=2, sort_keys=True))
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{
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"location": "Lofer",
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"region": "Salzburg"
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}
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>>> validate('4231') # not-existing postal code
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> validate('ABCD')
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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"""
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from __future__ import annotations
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from stdnum.exceptions import *
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from stdnum.util import clean, isdigits
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def compact(number: str) -> str:
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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 clean(number).strip()
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def info(number: str) -> dict[str, str]:
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"""Return a dictionary of data about the supplied number. This typically
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returns the location."""
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number = compact(number)
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from stdnum import numdb
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return numdb.get('at/postleitzahl').info(number)[0][1]
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def validate(number: str) -> str:
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"""Check if the number is a valid postal code."""
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number = compact(number)
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if not isdigits(number):
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raise InvalidFormat()
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if len(number) != 4:
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raise InvalidLength()
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if not info(number):
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raise InvalidComponent()
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return number
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def is_valid(number: str) -> bool:
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"""Check if the number is a valid postal code."""
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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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