Add docstring examples to boundary.py (#6487)

* Add docstring examples to boundary.py

* Change example to wheel_graph

1 files changed, 28 insertions, 0 deletions

diff --git a/networkx/algorithms/boundary.py b/networkx/algorithms/boundary.py
index 04d59de6..722d8521 100644
--- a/networkx/algorithms/boundary.py
+++ b/networkx/algorithms/boundary.py
@@ -59,6 +59,20 @@ def edge_boundary(G, nbunch1, nbunch2=None, data=False, keys=False, default=None
         are specified and `G` is a multigraph, then edges are returned
         with keys and/or data, as in :meth:`MultiGraph.edges`.
 
+    Examples
+    -------
+    >>> G = nx.wheel_graph(6)
+
+    When nbunch2=None:
+
+    >>> list(nx.edge_boundary(G, (1, 3)))
+    [(1, 0), (1, 2), (1, 5), (3, 0), (3, 2), (3, 4)]
+
+    When nbunch2 is given:
+
+    >>> list(nx.edge_boundary(G, (1, 3), (2, 0)))
+    [(1, 0), (1, 2), (3, 0), (3, 2)]
+
     Notes
     -----
     Any element of `nbunch` that is not in the graph `G` will be
@@ -121,6 +135,20 @@ def node_boundary(G, nbunch1, nbunch2=None):
     set
         The node boundary of `nbunch1` with respect to `nbunch2`.
 
+    Examples
+    -------
+    >>> G = nx.wheel_graph(6)
+
+    When nbunch2=None:
+
+    >>> list(nx.node_boundary(G, (3, 4)))
+    [0, 2, 5]
+
+    When nbunch2 is given:
+
+    >>> list(nx.node_boundary(G, (3, 4), (0, 1, 5)))
+    [0, 5]
+
     Notes
     -----
     Any element of `nbunch` that is not in the graph `G` will be