Let Notion document loader support utf-8 and make it default. (#10613)

Use utf-8 encoding by default

libs/langchain/langchain/document_loaders/notion.py

@@ -8,16 +8,17 @@ from langchain.document_loaders.base import BaseLoader
 class NotionDirectoryLoader(BaseLoader):
     """Load `Notion directory` dump."""
 
-    def __init__(self, path: str):
+    def __init__(self, path: str, *, encoding: str = "utf-8") -> None:
         """Initialize with a file path."""
         self.file_path = path
+        self.encoding = encoding
 
     def load(self) -> List[Document]:
         """Load documents."""
-        ps = list(Path(self.file_path).glob("**/*.md"))
+        paths = list(Path(self.file_path).glob("**/*.md"))
         docs = []
-        for p in ps:
-            with open(p) as f:
+        for p in paths:
+            with open(p, encoding=self.encoding) as f:
                 text = f.read()
             metadata = {"source": str(p)}
             docs.append(Document(page_content=text, metadata=metadata))