97 lines
2.9 KiB
Python
97 lines
2.9 KiB
Python
# tin.py - functions for handling TINs
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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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"""TIN (U.S. Taxpayer Identification Number).
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The Taxpayer Identification Number is used used for tax purposes in the
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United States. A TIN may be:
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* a Social Security Number (SSN)
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* an Individual Taxpayer Identification Number (ITIN)
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* an Employer Identification Number (EIN)
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* a Preparer Tax Identification Number (PTIN)
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* an Adoption Taxpayer Identification Number (ATIN)
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>>> compact('123-45-6789')
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'123456789'
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>>> validate('123-45-6789')
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'123456789'
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>>> validate('07-3456789')
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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>>> guess_type('536-90-4399')
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['ssn', 'atin']
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>>> guess_type('04-2103594')
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['ein']
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>>> guess_type('042103594')
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['ssn', 'ein', 'atin']
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>>> format('042103594')
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'042-10-3594'
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>>> format('123-456') # invalid numbers are not reformatted
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'123-456'
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"""
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from stdnum.exceptions import *
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from stdnum.us import ssn, itin, ein, ptin, atin
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from stdnum.util import clean
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_tin_modules = (ssn, itin, ein, ptin, atin)
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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 TIN. This searches
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for the proper sub-type and validates using that."""
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for mod in _tin_modules:
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try:
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return mod.validate(number)
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except ValidationError:
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pass # try next module
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# fallback
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raise InvalidFormat()
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def is_valid(number):
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"""Checks to see if the number provided is a valid TIN. This searches
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for the proper sub-type and validates using that."""
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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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def guess_type(number):
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"""Return a list of possible TIN types for which this number is
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valid.."""
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return [mod.__name__.rsplit('.', 1)[-1]
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for mod in _tin_modules
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if mod.is_valid(number)]
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def format(number):
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"""Reformat the passed number to the standard format."""
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for mod in _tin_modules:
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if mod.is_valid(number) and hasattr(mod, 'format'):
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return mod.format(number)
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return number
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