Improve type annotations in amsphinxql

mini_fiction/apis/amsphinxql.py

@@ -2,8 +2,13 @@
 from queue import Queue
 from threading import Lock, local
 from dataclasses import dataclass
+import typing
 from typing import Any, TypeVar, Union, Optional, Sequence, Tuple, List, Dict
 
+if typing.TYPE_CHECKING:
+    from MySQLdb.cursors import Cursor
+
+
 T = TypeVar("T", bound="SphinxConnection")
 
 
@@ -73,7 +78,7 @@ def _execute(
         self,
         sql: str,
         args: Optional[Sequence[Union[str, bytes]]] = None,
-    ):
+    ) -> "Cursor":
         cursor = self.mysql_conn.cursor()
         cursor.execute(sql, args)
         return cursor
@@ -389,7 +394,7 @@ def __init__(
         self,
         conn: Dict[str, Any],
         max_conns: int = 5,
-        conn_queue: Optional[Queue] = None,
+        conn_queue: "Optional[Queue[SphinxConnection]]" = None,
     ):
         self.conn = conn
         self.max_conns = max_conns