chore: adhere to PEP 585 and removed unused imports (#283)

samples/index_tuning_sample/README.md

@@ -187,7 +187,7 @@ class HNSWIndex(
     index_type: str = "hnsw",
     # Distance strategy does not affect recall and has minimal little on latency; refer to this guide to learn more https://cloud.google.com/spanner/docs/choose-vector-distance-function
     distance_strategy: DistanceStrategy = lambda : DistanceStrategy.COSINE_DISTANCE,
-    partial_indexes: List[str] | None = None,
+    partial_indexes: list[str] | None = None,
     m: int = 16,
     ef_construction: int = 64
 )
@@ -235,7 +235,7 @@ class IVFFlatIndex(
     name: str = DEFAULT_INDEX_NAME,
     index_type: str = "ivfflat",
     distance_strategy: DistanceStrategy = lambda : DistanceStrategy.COSINE_DISTANCE,
-    partial_indexes: List[str] | None = None,
+    partial_indexes: list[str] | None = None,
     lists: int = 1
 )
 

samples/langchain_on_vertexai/prebuilt_langchain_agent_template.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import os
-from typing import List
 
 import vertexai  # type: ignore
 from config import (
@@ -39,14 +38,14 @@
 engine = None  # Use global variable to share connection pooling
 
 
-def similarity_search(query: str) -> List[Document]:
+def similarity_search(query: str) -> list[Document]:
     """Searches and returns movies.
 
     Args:
       query: The user query to search for related items
 
     Returns:
-      List[Document]: A list of Documents
+      list[Document]: A list of Documents
     """
     global engine
     if not engine:  # Reuse connection pool

src/langchain_google_alloydb_pg/async_chat_message_history.py

@@ -15,7 +15,7 @@
 from __future__ import annotations
 
 import json
-from typing import List, Sequence
+from typing import Sequence
 
 from langchain_core.chat_history import BaseChatMessageHistory
 from langchain_core.messages import BaseMessage, messages_from_dict
@@ -128,7 +128,7 @@ async def aclear(self) -> None:
             await conn.execute(text(query), {"session_id": self.session_id})
             await conn.commit()
 
-    async def _aget_messages(self) -> List[BaseMessage]:
+    async def _aget_messages(self) -> list[BaseMessage]:
         """Retrieve the messages from AlloyDB."""
         query = f"""SELECT data, type FROM "{self.schema_name}"."{self.table_name}" WHERE session_id = :session_id ORDER BY id;"""
         async with self.pool.connect() as conn:

src/langchain_google_alloydb_pg/async_loader.py

@@ -15,7 +15,7 @@
 from __future__ import annotations
 
 import json
-from typing import Any, AsyncIterator, Callable, Dict, Iterable, List, Optional
+from typing import Any, AsyncIterator, Callable, Iterable, Optional
 
 from langchain_core.document_loaders.base import BaseLoader
 from langchain_core.documents import Document
@@ -28,24 +28,24 @@
 DEFAULT_METADATA_COL = "langchain_metadata"
 
 
-def text_formatter(row: dict, content_columns: List[str]) -> str:
+def text_formatter(row: dict, content_columns: list[str]) -> str:
     """txt document formatter."""
     return " ".join(str(row[column]) for column in content_columns if column in row)
 
 
-def csv_formatter(row: dict, content_columns: List[str]) -> str:
+def csv_formatter(row: dict, content_columns: list[str]) -> str:
     """CSV document formatter."""
     return ", ".join(str(row[column]) for column in content_columns if column in row)
 
 
-def yaml_formatter(row: dict, content_columns: List[str]) -> str:
+def yaml_formatter(row: dict, content_columns: list[str]) -> str:
     """YAML document formatter."""
     return "\n".join(
         f"{column}: {str(row[column])}" for column in content_columns if column in row
     )
 
 
-def json_formatter(row: dict, content_columns: List[str]) -> str:
+def json_formatter(row: dict, content_columns: list[str]) -> str:
     """JSON document formatter."""
     dictionary = {}
     for column in content_columns:
@@ -63,7 +63,7 @@ def _parse_doc_from_row(
 ) -> Document:
     """Parse row into document."""
     page_content = formatter(row, content_columns)
-    metadata: Dict[str, Any] = {}
+    metadata: dict[str, Any] = {}
     # unnest metadata from langchain_metadata column
     if metadata_json_column and row.get(metadata_json_column):
         for k, v in row[metadata_json_column].items():
@@ -81,10 +81,10 @@ def _parse_row_from_doc(
     column_names: Iterable[str],
     content_column: str = DEFAULT_CONTENT_COL,
     metadata_json_column: Optional[str] = DEFAULT_METADATA_COL,
-) -> Dict:
+) -> dict:
     """Parse document into a dictionary of rows."""
     doc_metadata = doc.metadata.copy()
-    row: Dict[str, Any] = {content_column: doc.page_content}
+    row: dict[str, Any] = {content_column: doc.page_content}
     for entry in doc.metadata:
         if entry in column_names:
             row[entry] = doc_metadata[entry]
@@ -111,8 +111,8 @@ def __init__(
         key: object,
         pool: AsyncEngine,
         query: str,
-        content_columns: List[str],
-        metadata_columns: List[str],
+        content_columns: list[str],
+        metadata_columns: list[str],
         formatter: Callable,
         metadata_json_column: Optional[str] = None,
     ) -> None:
@@ -122,8 +122,8 @@ def __init__(
             key (object): Prevent direct constructor usage.
             engine (AlloyDBEngine): AsyncEngine with pool connection to the postgres database
             query (Optional[str], optional): SQL query. Defaults to None.
-            content_columns (Optional[List[str]], optional): Column that represent a Document's page_content. Defaults to the first column.
-            metadata_columns (Optional[List[str]], optional): Column(s) that represent a Document's metadata. Defaults to None.
+            content_columns (Optional[list[str]], optional): Column that represent a Document's page_content. Defaults to the first column.
+            metadata_columns (Optional[list[str]], optional): Column(s) that represent a Document's metadata. Defaults to None.
             formatter (Optional[Callable], optional): A function to format page content (OneOf: format, formatter). Defaults to None.
             metadata_json_column (Optional[str], optional): Column to store metadata as JSON. Defaults to "langchain_metadata".
 
@@ -149,8 +149,8 @@ async def create(
         query: Optional[str] = None,
         table_name: Optional[str] = None,
         schema_name: str = "public",
-        content_columns: Optional[List[str]] = None,
-        metadata_columns: Optional[List[str]] = None,
+        content_columns: Optional[list[str]] = None,
+        metadata_columns: Optional[list[str]] = None,
         metadata_json_column: Optional[str] = None,
         format: Optional[str] = None,
         formatter: Optional[Callable] = None,
@@ -162,8 +162,8 @@ async def create(
             query (Optional[str], optional): SQL query. Defaults to None.
             table_name (Optional[str], optional): Name of table to query. Defaults to None.
             schema_name (str, optional): Name of the schema where table is located. Defaults to "public".
-            content_columns (Optional[List[str]], optional): Column that represent a Document's page_content. Defaults to the first column.
-            metadata_columns (Optional[List[str]], optional): Column(s) that represent a Document's metadata. Defaults to None.
+            content_columns (Optional[list[str]], optional): Column that represent a Document's page_content. Defaults to the first column.
+            metadata_columns (Optional[list[str]], optional): Column(s) that represent a Document's metadata. Defaults to None.
             metadata_json_column (Optional[str], optional): Column to store metadata as JSON. Defaults to "langchain_metadata".
             format (Optional[str], optional): Format of page content (OneOf: text, csv, YAML, JSON). Defaults to 'text'.
             formatter (Optional[Callable], optional): A function to format page content (OneOf: format, formatter). Defaults to None.
@@ -236,7 +236,7 @@ async def create(
             metadata_json_column,
         )
 
-    async def aload(self) -> List[Document]:
+    async def aload(self) -> list[Document]:
         """Load PostgreSQL data into Document objects."""
         return [doc async for doc in self.alazy_load()]
 
@@ -282,7 +282,7 @@ def __init__(
         table_name: str,
         content_column: str,
         schema_name: str = "public",
-        metadata_columns: List[str] = [],
+        metadata_columns: list[str] = [],
         metadata_json_column: Optional[str] = None,
     ):
         """AsyncAlloyDBDocumentSaver constructor.
@@ -293,7 +293,7 @@ def __init__(
             table_name (str): Name of table to query.
             schema_name (str, optional): Name of schema where the table is located. Defaults to "public".
             content_column (str, optional): Column that represent a Document's page_content. Defaults to "page_content".
-            metadata_columns (Optional[List[str]], optional): Column(s) that represent a Document's metadata. Defaults to an empty list.
+            metadata_columns (Optional[list[str]], optional): Column(s) that represent a Document's metadata. Defaults to an empty list.
             metadata_json_column (str, optional): Column to store metadata as JSON. Defaults to "langchain_metadata".
 
         Raises:
@@ -317,7 +317,7 @@ async def create(
         table_name: str,
         schema_name: str = "public",
         content_column: str = DEFAULT_CONTENT_COL,
-        metadata_columns: List[str] = [],
+        metadata_columns: list[str] = [],
         metadata_json_column: Optional[str] = DEFAULT_METADATA_COL,
     ) -> AsyncAlloyDBDocumentSaver:
         """Create an AsyncAlloyDBDocumentSaver instance.
@@ -327,7 +327,7 @@ async def create(
             table_name (str): Name of table to query.
             schema_name (str, optional): Name of schema where the table is located. Defaults to "public".
             content_column (str, optional): Column that represent a Document's page_content. Defaults to "page_content".
-            metadata_columns (List[str], optional): Column(s) that represent a Document's metadata. Defaults to an empty list.
+            metadata_columns (list[str], optional): Column(s) that represent a Document's metadata. Defaults to an empty list.
             metadata_json_column (Optional[str], optional): Column to store metadata as JSON. Defaults to "langchain_metadata".
 
         Returns:
@@ -370,13 +370,13 @@ async def create(
             metadata_json_column,
         )
 
-    async def aadd_documents(self, docs: List[Document]) -> None:
+    async def aadd_documents(self, docs: list[Document]) -> None:
         """
         Save documents in the DocumentSaver table. Document’s metadata is added to columns if found or
         stored in langchain_metadata JSON column.
 
         Args:
-            docs (List[langchain_core.documents.Document]): a list of documents to be saved.
+            docs (list[langchain_core.documents.Document]): a list of documents to be saved.
         """
 
         for doc in docs:
@@ -414,13 +414,13 @@ async def aadd_documents(self, docs: List[Document]) -> None:
                 await conn.execute(text(query), row)
                 await conn.commit()
 
-    async def adelete(self, docs: List[Document]) -> None:
+    async def adelete(self, docs: list[Document]) -> None:
         """
         Delete all instances of a document from the DocumentSaver table by matching the entire Document
         object.
 
         Args:
-            docs (List[langchain_core.documents.Document]): a list of documents to be deleted.
+            docs (list[langchain_core.documents.Document]): a list of documents to be deleted.
         """
         for doc in docs:
             row = _parse_row_from_doc(