create bull graph

.gitignore

@@ -128,4 +128,4 @@ dmypy.json
 
 # Pyre type checker
 .pyre/
-
+.idea/

generate-bull-graph.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+
+from igraph import *
+
+
+def generate_graph():
+    g = Graph()
+    g.add_vertices(5)
+    g.add_edges([(0, 1), (1, 2), (2, 3), (1, 3), (3, 4)])
+    plot(g)
+
+
+if __name__ == "__main__":
+    generate_graph()

requirements.txt

@@ -0,0 +1,2 @@
+python-igraph
+cairocffi