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Shared/lib/python3.4/site-packages/stdnum/us/ptin.py

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+# ptin.py - functions for handling  PTINs
+#
+# Copyright (C) 2013 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
+
+"""PTIN (U.S. Preparer Tax Identification Number).
+
+A Preparer Tax Identification Number (PTIN) is United States
+identification number for tax return preparers. It is an eight-digit
+number prefixed with a capital P.
+
+>>> validate('P-00634642')
+'P00634642'
+>>> validate('P01594846')
+'P01594846'
+>>> validate('00634642')  # missing P
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+"""
+
+import re
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+# regular expression for matching PTINs
+_ptin_re = re.compile('^P[0-9]{8}$')
+
+
+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 validate(number):
+    """Checks to see if the number provided is a valid PTIN. This checks
+    the length, groups and formatting if it is present."""
+    number = compact(number).upper()
+    if not _ptin_re.search(number):
+        raise InvalidFormat()
+    # sadly, no more information on PTIN number validation was found
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid ATIN. This checks
+    the length, groups and formatting if it is present."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False