Update chatllm.py

fix bug: add api key

chatllm.py

@@ -73,14 +73,6 @@ class ChatLLM(LLM):
         
         if self.model == 'ChatGPT':
 
-            OPENAI_API_KEY = os.getenv('openai_api_key')
-            OPENAI_URL = "https://api.openai.com/v1/chat/completions"
-            
-            headers = {
-                "Authorization": f"Bearer {OPENAI_API_KEY}",
-                "Content-Type": "application/json"
-            }
-
             # 添加过往问答记录，实现连贯多轮对话
             messages = [{"role": "system", "content": "You are a helpful assistant."}]
             for data in self.history:
@@ -88,6 +80,7 @@ class ChatLLM(LLM):
             messages.append({"role": "user", "content": prompt})
         
             # 配置OPENAI模型参数
+            openai.api_key = os.getenv('openai_api_key')
             response = openai.Completion.create(
                 model = 'gpt-3.5-turbo', 
                 messages = messages,