78 lines
2.3 KiB
Python
78 lines
2.3 KiB
Python
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# postcode.py - functions for handling Dutch postal codes
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#
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# Copyright (C) 2013 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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"""Postcode (Dutch postal code).
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The Dutch postal code consists of four numbers followed by two letters.
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>>> validate('2601 DC')
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'2601 DC'
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>>> validate('NL-2611ET')
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'2611 ET'
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>>> validate('26112 ET')
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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>>> validate('2611 SS') # a few letter combinations are banned
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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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import re
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from stdnum.exceptions import *
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from stdnum.util import clean
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_postcode_re = re.compile(r'^(?P<pt1>[1-9][0-9]{3})(?P<pt2>[A-Z]{2})$')
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_postcode_blacklist = ('SA', 'SD' ,'SS')
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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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number = clean(number, ' -').upper().strip()
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if number.startswith('NL'):
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number = number[2:]
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return number
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def validate(number):
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"""Checks to see if the number provided is in the correct format.
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This currently does not check whether the code corresponds to a real
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address."""
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number = compact(number)
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match = _postcode_re.search(number)
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if not match:
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raise InvalidFormat()
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if match.group('pt2') in _postcode_blacklist:
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raise InvalidComponent()
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return '%s %s' % (match.group('pt1'), match.group('pt2'))
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def is_valid(number):
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"""Checks to see if the number provided 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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