1. Build a basic chatbot using Gemini 2.0 flash

main.py

@@ -0,0 +1,35 @@
+# from src.graph_builder import build_graph
+from src.graph_builder import graph_builder
+from src.nodes import chatbot
+from langgraph.graph import START, END
+
+
+# The first argument is the unique node name
+# The second argument is the function or object that will be called whenever
+# the node is used.
+
+if __name__ == "__main__":
+    graph_builder.add_node("chatbot", chatbot)
+    graph_builder.add_edge(START, "chatbot")
+    graph_builder.add_edge("chatbot", END)
+    graph = graph_builder.compile()
+
+    def stream_graph_updates(user_input: str):
+        for event in graph.stream({"messages": [{"role": "user", "content": user_input}]}):
+            for value in event.values():
+                print("Assistant:", value["messages"][-1].content)
+
+
+    while True:
+        try:
+            user_input = input("User: ")
+            if user_input.lower() in ["quit", "exit", "q"]:
+                print("Goodbye!")
+                break
+            stream_graph_updates(user_input)
+        except:
+            # fallback if input() is not available
+            user_input = "What do you know about LangGraph?"
+            print("User: " + user_input)
+            stream_graph_updates(user_input)
+            break