history = history[-MAX_HISTORY_LENGTH:]

app.py

@@ -6,6 +6,8 @@ import os
 
 OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
 MAX_WITHOUT_KEY = 30
+MAX_HISTORY_LENGTH = 10
+
 
 PROMPTS = {
     "具體範例 Concrete examples": "你是一個樂於助人的AI tutor。你會透過提供具體範例以幫助他們學習新的概念。你總是調整你的範例以符合學生的生活及prior knowledge，你會舉出很多跟舉體且生活相關的範例以幫助學生，並透過一問一答的方式，確認學生的理解程度，請跟我解釋 {}?",
@@ -59,7 +61,17 @@ def openai_stream(history, openai_key, chat_model, use_key):
     ):
         content = chunk["choices"][0].get("delta", {}).get("content")
         if content:
-            history[-1][1] += content
+            # Assuming the format of history is [(message1, response1), (message2, response2), ...]
+            if history:
+                history[-1][1] += content  # Update the last response with the new content.
+            else:
+                # Handle the case where you might need to add a new message-response pair.
+                # This is just a generic example. You might need a different approach based on your exact requirements.
+                history.append((messages[-1]["content"], content))
+
+            # Ensure history keeps only the last 10 message-response pairs.
+            history = history[-MAX_HISTORY_LENGTH:]
+            
             yield history