chore: Add pylint for DB-GPT rag lib (#1267)

dbgpt/rag/knowledge/txt.py

@@ -1,3 +1,4 @@
+"""TXT Knowledge."""
 from typing import Any, List, Optional
 
 import chardet
@@ -12,7 +13,7 @@ from dbgpt.rag.knowledge.base import (
 
 
 class TXTKnowledge(Knowledge):
-    """TXT Knowledge"""
+    """TXT Knowledge."""
 
     def __init__(
         self,
@@ -21,21 +22,24 @@ class TXTKnowledge(Knowledge):
         loader: Optional[Any] = None,
         **kwargs: Any,
     ) -> None:
-        """Initialize with Knowledge arguments.
+        """Create TXT Knowledge with Knowledge arguments.
+
         Args:
-            file_path:(Optional[str]) file path
-            knowledge_type:(KnowledgeType) knowledge type
-            loader:(Optional[Any]) loader
+            file_path(str,  optional): file path
+            knowledge_type(KnowledgeType, optional): knowledge type
+            loader(Any, optional): loader
         """
         self._path = file_path
         self._type = knowledge_type
         self._loader = loader
 
     def _load(self) -> List[Document]:
-        """Load txt document from loader"""
+        """Load txt document from loader."""
         if self._loader:
             documents = self._loader.load()
         else:
+            if not self._path:
+                raise ValueError("file path is required")
             with open(self._path, "rb") as f:
                 raw_text = f.read()
                 result = chardet.detect(raw_text)
@@ -50,6 +54,7 @@ class TXTKnowledge(Knowledge):
 
     @classmethod
     def support_chunk_strategy(cls):
+        """Return support chunk strategy."""
         return [
             ChunkStrategy.CHUNK_BY_SIZE,
             ChunkStrategy.CHUNK_BY_SEPARATOR,
@@ -57,12 +62,15 @@ class TXTKnowledge(Knowledge):
 
     @classmethod
     def default_chunk_strategy(cls) -> ChunkStrategy:
+        """Return default chunk strategy."""
         return ChunkStrategy.CHUNK_BY_SIZE
 
     @classmethod
     def type(cls) -> KnowledgeType:
+        """Return knowledge type."""
         return KnowledgeType.DOCUMENT
 
     @classmethod
     def document_type(cls) -> DocumentType:
+        """Return document type."""
         return DocumentType.TXT