bpo-39481: PEP 585 for a variety of modules (GH-19423)

- concurrent.futures
- ctypes
- http.cookies
- multiprocessing
- queue
- tempfile
- unittest.case
- urllib.parse

Lib/multiprocessing/managers.py

@@ -21,6 +21,7 @@ import signal
 import array
 import queue
 import time
+import types
 import os
 from os import getpid
 
@@ -1129,6 +1130,8 @@ class ValueProxy(BaseProxy):
         return self._callmethod('set', (value,))
     value = property(get, set)
 
+    __class_getitem__ = classmethod(types.GenericAlias)
+
 
 BaseListProxy = MakeProxyType('BaseListProxy', (
     '__add__', '__contains__', '__delitem__', '__getitem__', '__len__',

Lib/multiprocessing/pool.py

@@ -20,6 +20,7 @@ import queue
 import threading
 import time
 import traceback
+import types
 import warnings
 from queue import Empty
 
@@ -780,6 +781,8 @@ class ApplyResult(object):
         del self._cache[self._job]
         self._pool = None
 
+    __class_getitem__ = classmethod(types.GenericAlias)
+
 AsyncResult = ApplyResult       # create alias -- see #17805
 
 #

Lib/multiprocessing/queues.py

@@ -14,6 +14,7 @@ import os
 import threading
 import collections
 import time
+import types
 import weakref
 import errno
 
@@ -366,3 +367,5 @@ class SimpleQueue(object):
         else:
             with self._wlock:
                 self._writer.send_bytes(obj)
+
+    __class_getitem__ = classmethod(types.GenericAlias)

Lib/multiprocessing/shared_memory.py

@@ -14,6 +14,7 @@ import os
 import errno
 import struct
 import secrets
+import types
 
 if os.name == "nt":
     import _winapi
@@ -508,3 +509,5 @@ class ShareableList:
                 return position
         else:
             raise ValueError(f"{value!r} not in this container")
+
+    __class_getitem__ = classmethod(types.GenericAlias)