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Shared/lib/python3.4/site-packages/stdnum/es/dni.py

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+# dni.py - functions for handling Spanish personal identity codes
+# coding: utf-8
+#
+# Copyright (C) 2012, 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
+
+"""DNI (Documento nacional de identidad, Spanish personal identity codes).
+
+The DNI is a 9 digit number used to identify Spanish citizens. The last
+digit is a checksum letter.
+
+Foreign nationals, since 2010 are issued an NIE (Número de Identificación
+de Extranjeros, Foreigner's Identity Number) instead.
+
+>>> validate('54362315-K')
+'54362315K'
+>>> validate('54362315Z')  # invalid check digit
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> validate('54362315')  # digit missing
+Traceback (most recent call last):
+    ...
+InvalidLength: ...
+"""
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+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, ' -').upper().strip()
+
+
+def calc_check_digit(number):
+    """Calculate the check digit. The number passed should not have the
+    check digit included."""
+    return 'TRWAGMYFPDXBNJZSQVHLCKE'[int(number) % 23]
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid DNI number. This
+    checks the length, formatting and check digit."""
+    number = compact(number)
+    if not number[:-1].isdigit():
+        raise InvalidFormat()
+    if len(number) != 9:
+        raise InvalidLength()
+    if calc_check_digit(number[:-1]) != number[-1]:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid DNI number. This
+    checks the length, formatting and check digit."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False