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# postleitzahl.py - functions for handling Austrian postal codes
#
# Copyright (C) 2018 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
"""Postleitzahl (Austrian postal code).
The Austrian postal code consists of four digits that identifies a post
office in Austria.
More information:
* https://en.wikipedia.org/wiki/Postal_codes_in_Austria
* https://www.post.at/suche/standortsuche.php/index/selectedsearch/plz
>>> validate('5090')
'5090'
>>> import json
>>> print(json.dumps(info('5090'), indent=2, sort_keys=True))
{
"location": "Lofer",
"region": "Salzburg"
}
>>> validate('4231') # not-existing postal code
Traceback (most recent call last):
...
InvalidComponent: ...
>>> validate('ABCD')
Traceback (most recent call last):
...
InvalidFormat: ...
"""
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number).strip()
def info(number):
"""Return a dictionary of data about the supplied number. This typically
returns the location."""
number = compact(number)
from stdnum import numdb
return numdb.get('at/postleitzahl').info(number)[0][1]
def validate(number):
"""Check if the number is a valid postal code."""
number = compact(number)
if not isdigits(number):
raise InvalidFormat()
if len(number) != 4:
raise InvalidLength()
if not info(number):
raise InvalidComponent()
return number
def is_valid(number):
"""Check if the number is a valid postal code."""
try:
return bool(validate(number))
except ValidationError:
return False
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