feat: 1. replace black with ruff for fomatting and sort import (#489)

2. use tavily from`langchain-tavily` rather than the older one from `langchain-community`

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

src/rag/__init__.py

@@ -1,10 +1,10 @@
 # Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
 # SPDX-License-Identifier: MIT
 
-from .retriever import Retriever, Document, Resource, Chunk
-from .ragflow import RAGFlowProvider
-from .vikingdb_knowledge_base import VikingDBKnowledgeBaseProvider
 from .builder import build_retriever
+from .ragflow import RAGFlowProvider
+from .retriever import Chunk, Document, Resource, Retriever
+from .vikingdb_knowledge_base import VikingDBKnowledgeBaseProvider
 
 __all__ = [
     Retriever,

src/rag/builder.py

@@ -3,8 +3,8 @@
 
 from src.config.tools import SELECTED_RAG_PROVIDER, RAGProvider
 from src.rag.ragflow import RAGFlowProvider
-from src.rag.vikingdb_knowledge_base import VikingDBKnowledgeBaseProvider
 from src.rag.retriever import Retriever
+from src.rag.vikingdb_knowledge_base import VikingDBKnowledgeBaseProvider
 
 
 def build_retriever() -> Retriever | None:

src/rag/ragflow.py

@@ -2,11 +2,13 @@
 # SPDX-License-Identifier: MIT
 
 import os
-import requests
-from src.rag.retriever import Chunk, Document, Resource, Retriever
 from typing import List, Optional
 from urllib.parse import urlparse
 
+import requests
+
+from src.rag.retriever import Chunk, Document, Resource, Retriever
+
 
 class RAGFlowProvider(Retriever):
     """

src/rag/retriever.py

@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: MIT
 
 import abc
+
 from pydantic import BaseModel, Field
 
 

src/rag/vikingdb_knowledge_base.py

@@ -1,16 +1,18 @@
 # Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
 # SPDX-License-Identifier: MIT
 
-import os
-import requests
-import json
 import hashlib
 import hmac
+import json
+import os
 import urllib.parse
 from datetime import datetime
-from src.rag.retriever import Chunk, Document, Resource, Retriever
 from urllib.parse import urlparse
 
+import requests
+
+from src.rag.retriever import Chunk, Document, Resource, Retriever
+
 
 class VikingDBKnowledgeBaseProvider(Retriever):
     """