Revert "[3.12] pythongh-126417: Register multiprocessing proxy types …

…to an appropriate collections.abc class (python#126419) (python#126436)"

This reverts commit 47d48b6.

Lib/multiprocessing/managers.py

@@ -18,7 +18,6 @@
 import threading
 import signal
 import array
-import collections.abc
 import queue
 import time
 import types
@@ -1161,8 +1160,6 @@ def __imul__(self, value):
         return self
 
 
-collections.abc.MutableSequence.register(BaseListProxy)
-
 DictProxy = MakeProxyType('DictProxy', (
     '__contains__', '__delitem__', '__getitem__', '__iter__', '__len__',
     '__setitem__', 'clear', 'copy', 'get', 'items',
@@ -1172,7 +1169,6 @@ def __imul__(self, value):
     '__iter__': 'Iterator',
     }
 
-collections.abc.MutableMapping.register(DictProxy)
 
 ArrayProxy = MakeProxyType('ArrayProxy', (
     '__len__', '__getitem__', '__setitem__'

Lib/test/_test_multiprocessing.py

@@ -17,7 +17,6 @@
 import functools
 import signal
 import array
-import collections.abc
 import socket
 import random
 import logging
@@ -2460,10 +2459,6 @@ def test_list(self):
         a.append('hello')
         self.assertEqual(f[0][:], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'hello'])
 
-    def test_list_isinstance(self):
-        a = self.list()
-        self.assertIsInstance(a, collections.abc.MutableSequence)
-
     def test_list_iter(self):
         a = self.list(list(range(10)))
         it = iter(a)
@@ -2504,10 +2499,6 @@ def test_dict(self):
         self.assertEqual(sorted(d.values()), [chr(i) for i in indices])
         self.assertEqual(sorted(d.items()), [(i, chr(i)) for i in indices])
 
-    def test_dict_isinstance(self):
-        a = self.dict()
-        self.assertIsInstance(a, collections.abc.MutableMapping)
-
     def test_dict_iter(self):
         d = self.dict()
         indices = list(range(65, 70))

Misc/ACKS

@@ -1259,7 +1259,6 @@ Emily Morehouse
 Derek Morr
 James A Morrison
 Martin Morrison
-Stephen Morton
 Derek McTavish Mounce
 Alessandro Moura
 Pablo Mouzo