replace optional with union

ptvp35/__init__.py

@@ -6,7 +6,7 @@ import pathlib
 import threading
 import traceback
 from io import StringIO, UnsupportedOperation
-from typing import Any, Optional, IO, Hashable
+from typing import Any, IO, Hashable
 
 
 __all__ = (
@@ -25,7 +25,7 @@ class Request:
         '__future',
     )
 
-    def __init__(self, future: Optional[asyncio.Future], /) -> None:
+    def __init__(self, future: asyncio.Future | None, /) -> None:
         self.__future = future
 
     def waiting(self, /) -> bool:
@@ -49,7 +49,7 @@ class LineRequest(Request):
         'line',
     )
 
-    def __init__(self, line: str, /, *, future: Optional[asyncio.Future]) -> None:
+    def __init__(self, line: str, /, *, future: asyncio.Future | None) -> None:
         super().__init__(future)
         self.line = line
 
@@ -76,7 +76,7 @@ note: unstable signature."""
         key, value = self.fromline(line)
         db[key] = value
 
-    def request(self, key: Any, value: Any, /, *, future: Optional[asyncio.Future]) -> 'KVRequest':
+    def request(self, key: Any, value: Any, /, *, future: asyncio.Future | None) -> 'KVRequest':
         """form request with Future.
 low-level API.
 note: unstable signature."""
@@ -95,7 +95,7 @@ class KVRequest(LineRequest):
         'value',
     )
 
-    def __init__(self, key: Any, value: Any, /, *, future: Optional[asyncio.Future], factory: KVFactory):
+    def __init__(self, key: Any, value: Any, /, *, future: asyncio.Future | None, factory: KVFactory):
         super().__init__(factory.line(key, value), future=future)
         self.__factory = factory
         self.key = key
@@ -141,7 +141,7 @@ class TransactionRequest(LineRequest):
         'buffer',
     )
 
-    def __init__(self, buffer: StringIO, /, *, future: Optional[asyncio.Future]):
+    def __init__(self, buffer: StringIO, /, *, future: asyncio.Future | None):
         super().__init__(buffer.getvalue(), future=future)
         self.buffer = buffer
 
@@ -393,13 +393,13 @@ note: unstable signature."""
         self.__path_recover.unlink()
         self.__path_backup.unlink()
 
-    def _copy_sync(self, db: Optional[dict], /) -> None:
+    def _copy_sync(self, db: dict | None, /) -> None:
         if db is None:
             db = {}
             self._path2db_sync(self.__path_backup, db)
         self._db2path_sync(db, self.__path)
 
-    def _finish_recovery_sync(self, db: Optional[dict], /) -> None:
+    def _finish_recovery_sync(self, db: dict | None, /) -> None:
         self._copy_sync(db)
         self._recovery_unset_sync()