Add exception class NodeNotFound

1 files changed, 6 insertions, 0 deletions

diff --git a/networkx/exception.py b/networkx/exception.py
index 72696b24..4c1a1ec0 100644
--- a/networkx/exception.py
+++ b/networkx/exception.py
@@ -52,3 +52,9 @@ class NetworkXUnbounded(NetworkXAlgorithmError):
 
 class NetworkXNotImplemented(NetworkXException):
     """Exception raised by algorithms not implemented for a type of graph."""
+
+class NotFound(NetworkXException):
+    """Exception"""
+
+class NodeNotFound(NotFound):
+    """Exception raised if node is not present in the graph"""