Added new exceptions

lib/python/Interface/Exceptions.py

 
+class DoesNotImplement(Exception):
+    """ This object does not implement """
+    def __init__(self, interface):
+        self.interface = interface
+
+    def __str__(self):
+        return """An object does not implement interface %(interface)s
+
+        """ % self.__dict__
+
 class BrokenImplementation(Exception):
     """An attribute is not completely implemented.
     """
@@ -13,4 +23,20 @@ class BrokenImplementation(Exception):
         The %(name)s attribute was not provided.
         """ % self.__dict__
 
+class BrokenMethodImplementation(Exception):
+    """An method is not completely implemented.
+    """
+
+    def __init__(self, method, name):
+        self.method=method
+        self.name=name
+
+    def __str__(self):
+        return """An object has failed to implement the method %(method)s
+
+        The %(name)s signature attribute is incorrect.
+        """ % self.__dict__
+
 class InvalidInterface(Exception): pass
+
+