diff --git a/comps/cores/mega/micro_service.py b/comps/cores/mega/micro_service.py
index 0f161b05b9..7afd7c4a24 100644
--- a/comps/cores/mega/micro_service.py
+++ b/comps/cores/mega/micro_service.py
@@ -3,18 +3,21 @@
 
 import asyncio
 import multiprocessing
-import requests
 import time
 from typing import Any, List, Optional, Type
 
+import requests
+
 from ..proto.docarray import TextDoc
 from .constants import ServiceRoleType, ServiceType
-from .utils import check_ports_availability
 from .logger import CustomLogger
+from .utils import check_ports_availability
 
 opea_microservices = {}
 
 logger = CustomLogger("micro-service")
+
+
 class MicroService:
     """MicroService class to create a microservice."""
 
@@ -56,7 +59,7 @@ def __init__(
                             else:
                                 logger.info(f"LLM endpoint is ready - but error status code - {llm_endpoint}")
                             success = True
-                        
+
                 except requests.exceptions.RequestException as e:
                     logger.info(f"Error: {e} - {llm_endpoint}")
                     time.sleep(2.5)
diff --git a/comps/llms/text-generation/vllm/llama_index/llm.py b/comps/llms/text-generation/vllm/llama_index/llm.py
index 5df13f07f7..0111ea9fc6 100644
--- a/comps/llms/text-generation/vllm/llama_index/llm.py
+++ b/comps/llms/text-generation/vllm/llama_index/llm.py
@@ -38,7 +38,7 @@ def post_process_text(text: str):
     endpoint="/v1/chat/completions",
     host="0.0.0.0",
     port=9000,
-    llm_endpoint = os.getenv("vLLM_ENDPOINT", "http://localhost:8008"),
+    llm_endpoint=os.getenv("vLLM_ENDPOINT", "http://localhost:8008"),
 )
 def llm_generate(input: LLMParamsDoc):
     if logflag: