Update app.py

app.py

@@ -35,9 +35,9 @@ def splitIsnad(dataframe):
 def network_visualizer(city, year, num_nodes):
     edges = splitIsnad(subsetEdges(city, year))[['Teacher', 'Student', 'Hadiths']].groupby(['Teacher', 'Student']).sum().reset_index()
     if edges.shape[0] > num_nodes:
-        edge_15 = edge_15.sample(num_nodes)
+        edge_15 = edges.sample(num_nodes)
     else:
-        edge_15 = edge.copy()
+        edge_15 = edges.copy()
     teacher_hadiths = edge_15[['Teacher', 'Hadiths']].groupby('Teacher').sum().reset_index()
     net = Network()
     for _, row in edge_15.iterrows():