1 files changed, 71 insertions, 0 deletions
diff --git a/stdnum/me/iban.py b/stdnum/me/iban.py
new file mode 100644
index 0000000..248aa22
--- /dev/null
+++ b/stdnum/me/iban.py
@@ -0,0 +1,71 @@
+# iban.py - functions for handling Montenegro IBANs
+# coding: utf-8
+#
+# Copyright (C) 2018 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
+
+"""Montenegro IBAN (International Bank Account Number).
+
+The IBAN is used to identify bank accounts across national borders. The
+Montenegro IBAN is built up of the IBAN prefix (ME) and check digits,
+followed by a 3 digit bank identifier, a 13 digit account number and 2 more
+check digits.
+
+>>> validate('ME 2551 0000 0000 0623 4133')
+'ME25510000000006234133'
+>>> validate('ME52510000000006234132')  # incorrect national check digits
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+>>> validate('GR1601101050000010547023795')  # not a Montenegro IBAN
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+"""
+
+from stdnum import iban
+from stdnum.exceptions import *
+
+
+__all__ = ['compact', 'format', 'validate', 'is_valid']
+
+
+compact = iban.compact
+format = iban.format
+
+
+def _checksum(number):
+    """Calculate the check digits over the provided part of the number."""
+    return int(number) % 97
+
+
+def validate(number):
+    """Check if the number provided is a valid Montenegro IBAN."""
+    number = iban.validate(number, check_country=False)
+    if not number.startswith('ME'):
+        raise InvalidComponent()
+    if _checksum(number[4:]) != 1:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number):
+    """Check if the number provided is a valid Montenegro IBAN."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False