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

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

Lib/concurrent/futures/_base.py

@@ -7,6 +7,7 @@ import collections
 import logging
 import threading
 import time
+import types
 
 FIRST_COMPLETED = 'FIRST_COMPLETED'
 FIRST_EXCEPTION = 'FIRST_EXCEPTION'
@@ -544,6 +545,8 @@ class Future(object):
             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."""