python · isidentical · Apr 8, 2020 · gvanrossum · Apr 10, 2020
diff --git a/Lib/concurrent/futures/_base.py b/Lib/concurrent/futures/_base.py
@@ -7,6 +7,7 @@
 import logging
 import threading
 import time
+import types
 
 FIRST_COMPLETED = 'FIRST_COMPLETED'
 FIRST_EXCEPTION = 'FIRST_EXCEPTION'
@@ -544,6 +545,8 @@ def set_exception(self, exception):
             self._condition.notify_all()
         self._invoke_callbacks()
 
+    __class_getitem__ = classmethod(types.GenericAlias)
+
 class Executor(object):
     """This is an abstract base class for concrete asynchronous executors."""
 

diff --git a/Lib/concurrent/futures/thread.py b/Lib/concurrent/futures/thread.py
@@ -10,6 +10,7 @@
 import itertools
 import queue
 import threading
+import types
 import weakref
 import os
 
@@ -57,6 +58,8 @@ def run(self):
         else:
             self.future.set_result(result)
 
+    __class_getitem__ = classmethod(types.GenericAlias)
+
 
 def _worker(executor_reference, work_queue, initializer, initargs):
     if initializer is not None:

diff --git a/Lib/http/cookies.py b/Lib/http/cookies.py
@@ -131,6 +131,7 @@
 #
 import re
 import string
+import types
 
 __all__ = ["CookieError", "BaseCookie", "SimpleCookie"]
 
@@ -419,6 +420,8 @@ def OutputString(self, attrs=None):
         # Return the result
         return _semispacejoin(result)
 
+    __class_getitem__ = classmethod(types.GenericAlias)
+
 
 #
 # Pattern for finding cookie

diff --git a/Lib/multiprocessing/managers.py b/Lib/multiprocessing/managers.py
@@ -21,6 +21,7 @@
 import array
 import queue
 import time
+import types
 import os
 from os import getpid
 
@@ -1129,6 +1130,8 @@ def set(self, value):
         return self._callmethod('set', (value,))
     value = property(get, set)
 
+    __class_getitem__ = classmethod(types.GenericAlias)
+
 
 BaseListProxy = MakeProxyType('BaseListProxy', (
     '__add__', '__contains__', '__delitem__', '__getitem__', '__len__',

diff --git a/Lib/multiprocessing/pool.py b/Lib/multiprocessing/pool.py
@@ -20,6 +20,7 @@
 import threading
 import time
 import traceback
+import types
 import warnings
 from queue import Empty
 
@@ -780,6 +781,8 @@ def _set(self, i, obj):
         del self._cache[self._job]
         self._pool = None
 
+    __class_getitem__ = classmethod(types.GenericAlias)
+
 AsyncResult = ApplyResult       # create alias -- see #17805
 
 #

diff --git a/Lib/multiprocessing/queues.py b/Lib/multiprocessing/queues.py
@@ -14,6 +14,7 @@
 import threading
 import collections
 import time
+import types
 import weakref
 import errno
 
@@ -366,3 +367,5 @@ def put(self, obj):
         else:
             with self._wlock:
                 self._writer.send_bytes(obj)
+
+    __class_getitem__ = classmethod(types.GenericAlias)
diff --git a/Lib/multiprocessing/shared_memory.py b/Lib/multiprocessing/shared_memory.py
@@ -14,6 +14,7 @@
 import errno
 import struct
 import secrets
+import types
 
 if os.name == "nt":
     import _winapi
@@ -508,3 +509,5 @@ def index(self, value):
                 return position
         else:
             raise ValueError(f"{value!r} not in this container")
+
+    __class_getitem__ = classmethod(types.GenericAlias)
diff --git a/Lib/test/test_genericalias.py b/Lib/test/test_genericalias.py
@@ -6,7 +6,14 @@
     defaultdict, deque, OrderedDict, Counter, UserDict, UserList
 )
 from collections.abc import *
+from concurrent.futures import Future
+from concurrent.futures.thread import _WorkItem
 from contextlib import AbstractContextManager, AbstractAsyncContextManager
+from http.cookies import Morsel
+from multiprocessing.managers import ValueProxy
+from multiprocessing.pool import ApplyResult
+from multiprocessing.shared_memory import ShareableList
+from multiprocessing.queues import SimpleQueue
 from os import DirEntry
 from re import Pattern, Match
 from types import GenericAlias, MappingProxyType
@@ -35,7 +42,11 @@ def test_subscriptable(self):
                   Mapping, MutableMapping, MappingView,
                   KeysView, ItemsView, ValuesView,
                   Sequence, MutableSequence,
-                  MappingProxyType, DirEntry
+                  MappingProxyType, DirEntry,
+                  ValueProxy, ApplyResult,
+                  ShareableList, SimpleQueue,
+                  Future, _WorkItem,
+                  Morsel
                   ):
             tname = t.__name__
             with self.subTest(f"Testing {tname}"):