s4-python: Some reformatting for the purpose of pydoctor.

source4/scripting/python/samba/ndr.py

@@ -1,31 +1,49 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
 # Unix SMB/CIFS implementation.
 # Copyright © Jelmer Vernooij <jelmer@samba.org> 2008
-#   
+#
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
-#   
+#
 # This program 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 General Public License for more details.
-#   
+#
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+
+"""Network Data Representation (NDR) marshalling and unmarshalling."""
+
+
 def ndr_pack(object):
-    return object.__ndr_pack__()
+    """Pack a NDR object.
+    
+    :param object: Object to pack
+    :return: String object with marshalled object.
+    """
+    ndr_pack = getattr(object, "__ndr_pack__", None)
+    if ndr_pack is None:
+        raise TypeError("%r is not a NDR object" % object)
+    return ndr_pack()
 
 
 def ndr_unpack(cls, data):
+    """NDR unpack an object.
+
+    :param cls: Class of the object to unpack
+    :param data: Buffer to unpack
+    :return: Unpacked object
+    """
     object = cls()
     object.__ndr_unpack__(data)
     return object
 
+
 def ndr_print(object):
     return object.__ndr_print__()