Change exception varname e to err (#5130)

A more descriptive variable name for exceptions. This reduces local var naming conflicts when
\`e\` is used e.g. to represent edges as a loop variable.

1 files changed, 2 insertions, 2 deletions

diff --git a/examples/subclass/plot_antigraph.py b/examples/subclass/plot_antigraph.py
index ec6a97c4..154a321b 100644
--- a/examples/subclass/plot_antigraph.py
+++ b/examples/subclass/plot_antigraph.py
@@ -65,8 +65,8 @@ class AntiGraph(Graph):
         """
         try:
             return iter(set(self.adj) - set(self.adj[n]) - {n})
-        except KeyError as e:
-            raise nx.NetworkXError(f"The node {n} is not in the graph.") from e
+        except KeyError as err:
+            raise nx.NetworkXError(f"The node {n} is not in the graph.") from err
 
     def degree(self, nbunch=None, weight=None):
         """Return an iterator for (node, degree) in the dense graph.