bpo-32154: Remove asyncio.selectors (#4605)

* Remove asyncio.selectors and asyncio._overlapped symbols from the
  namespace of the asyncio module
* Replace "from asyncio import selectors" with "import selectors"
* Replace "from asyncio import _overlapped" with "import _overlapped"

asyncio.selectors was added to support Python 3.3, which doesn't have
selectors in its standard library, and Python 3.4 in the same code
base. Same rationale for asyncio._overlapped. Python 3.3 reached its
end of life, and asyncio is no more maintained as a third party
module on PyPI.

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/asyncio/test_utils.py b/Lib/asyncio/test_utils.py
index c3ddfe3756..f797b2f0be 100644
--- a/Lib/asyncio/test_utils.py
+++ b/Lib/asyncio/test_utils.py
@@ -6,6 +6,7 @@ import io
 import logging
 import os
 import re
+import selectors
 import socket
 import socketserver
 import sys
@@ -28,7 +29,6 @@ except ImportError:  # pragma: no cover
 from . import base_events
 from . import events
 from . import futures
-from . import selectors
 from . import tasks
 from .coroutines import coroutine
 from .log import logger