Create app.py

app.py

@@ -0,0 +1,29 @@
+from fastapi import FastAPI, Request
+from pydantic import BaseModel
+import openai
+import os
+
+openai.api_key = os.getenv("OPENAI_API_KEY")
+
+app = FastAPI()
+
+class ChatRequest(BaseModel):
+    message: str
+    history: list = []
+
+@app.post("/chat")
+async def chat(data: ChatRequest):
+    messages = [{"role": "system", "content": "You are a helpful assistant."}]
+    messages += data.history
+    messages.append({"role": "user", "content": data.message})
+
+    response = openai.ChatCompletion.create(
+        model="gpt-3.5-turbo",
+        messages=messages
+    )
+
+    reply = response['choices'][0]['message']['content']
+    return {
+        "reply": reply,
+        "history": messages + [{"role": "assistant", "content": reply}]
+    }