Use PEP 604 syntax wherever possible (#7493)

stdlib/@python2/dbm/__init__.pyi

@@ -1,10 +1,10 @@
 from _typeshed import Self
 from types import TracebackType
-from typing import Iterator, MutableMapping, Union
+from typing import Iterator, MutableMapping
 from typing_extensions import Literal
 
-_KeyType = Union[str, bytes]
-_ValueType = Union[str, bytes]
+_KeyType = str | bytes
+_ValueType = str | bytes
 
 class _Database(MutableMapping[_KeyType, bytes]):
     def close(self) -> None: ...

stdlib/@python2/dbm/dumb.pyi

@@ -1,9 +1,9 @@
 from _typeshed import Self
 from types import TracebackType
-from typing import Iterator, MutableMapping, Union
+from typing import Iterator, MutableMapping
 
-_KeyType = Union[str, bytes]
-_ValueType = Union[str, bytes]
+_KeyType = str | bytes
+_ValueType = str | bytes
 
 error = OSError
 

stdlib/@python2/dbm/gnu.pyi

@@ -1,10 +1,10 @@
 from _typeshed import Self
 from types import TracebackType
-from typing import TypeVar, Union, overload
+from typing import TypeVar, overload
 
 _T = TypeVar("_T")
-_KeyType = Union[str, bytes]
-_ValueType = Union[str, bytes]
+_KeyType = str | bytes
+_ValueType = str | bytes
 
 class error(OSError): ...
 

stdlib/@python2/dbm/ndbm.pyi

@@ -1,10 +1,10 @@
 from _typeshed import Self
 from types import TracebackType
-from typing import TypeVar, Union, overload
+from typing import TypeVar, overload
 
 _T = TypeVar("_T")
-_KeyType = Union[str, bytes]
-_ValueType = Union[str, bytes]
+_KeyType = str | bytes
+_ValueType = str | bytes
 
 class error(OSError): ...