Update bfs_exercise_solution.py

Author: nikhilailani

algorithms/9_BreadthFirstSearch/bfs_exercise_solution.py

@@ -18,10 +18,12 @@ def bfs(data, start, end, visited=[]):
 
 
 if __name__ == '__main__':
-  data = {'A': {'B'},
-        'B': {'C', 'D'},
-        'C': {'E'},
-        'D': {'E'},
-        'E': {'F'},
-        'F': set()}
+  data = {
+    'A': {'B'},
+    'B': {'C', 'D'},
+    'C': {'E'},
+    'D': {'E'},
+    'E': {'F'},
+    'F': set()
+  }
   bfs(data, 'A', 'D')