Update strings.py

strings.py

@@ -0,0 +1,8 @@
+dfs_code = r"""
+def dfs(visited, graph, node):  #function for dfs 
+    if node not in visited:
+        print (node)
+        visited.add(node)
+        for neighbour in graph[node]:
+            dfs(visited, graph, neighbour)
+"""