Clean up existing unused code according to flake8

metagpt/tools/prompt_writer.py

@@ -5,7 +5,6 @@
 @Author  : alexanderwu
 @File    : prompt_writer.py
 """
-from abc import ABC
 from typing import Union
 
 

metagpt/tools/search_engine.py

@@ -9,8 +9,6 @@ from __future__ import annotations
 
 import json
 
-from duckduckgo_search import ddg
-
 from metagpt.config import Config
 from metagpt.logs import logger
 from metagpt.tools.search_engine_serpapi import SerpAPIWrapper

metagpt/tools/search_engine_meilisearch.py

@@ -11,8 +11,6 @@ from typing import List
 import meilisearch
 from meilisearch.index import Index
 
-from metagpt.logs import logger
-
 
 class DataSource:
     def __init__(self, name: str, url: str):

metagpt/tools/search_engine_serpapi.py

@@ -11,7 +11,6 @@ import aiohttp
 from pydantic import BaseModel, Field
 
 from metagpt.config import Config
-from metagpt.logs import logger
 
 
 class SerpAPIWrapper(BaseModel):

metagpt/tools/search_engine_serper.py

@@ -12,7 +12,6 @@ import aiohttp
 from pydantic import BaseModel, Field
 
 from metagpt.config import Config
-from metagpt.logs import logger
 
 
 class SerperWrapper(BaseModel):
@@ -55,7 +54,6 @@ class SerperWrapper(BaseModel):
             async with aiohttp.ClientSession() as session:
                 async with session.post(url, data=payloads, headers=headers) as response:
                     res = await response.json()
-                    
         else:
             async with self.aiosession.get.post(url, data=payloads, headers=headers) as response:
                 res = await response.json()