68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
# ptin.py - functions for handling PTINs
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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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"""PTIN (U.S. Preparer Tax Identification Number).
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A Preparer Tax Identification Number (PTIN) is United States
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identification number for tax return preparers. It is an eight-digit
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number prefixed with a capital P.
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>>> validate('P-00634642')
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'P00634642'
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>>> validate('P01594846')
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'P01594846'
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>>> validate('00634642') # missing P
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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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import re
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from stdnum.exceptions import *
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from stdnum.util import clean
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# regular expression for matching PTINs
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_ptin_re = re.compile(r'^P[0-9]{8}$')
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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 clean(number, '-').strip()
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def validate(number):
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"""Checks to see if the number provided is a valid PTIN. This checks
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the length, groups and formatting if it is present."""
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number = compact(number).upper()
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if not _ptin_re.search(number):
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raise InvalidFormat()
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# sadly, no more information on PTIN number validation was found
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid ATIN. This checks
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the length, groups and formatting if it is present."""
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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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