bpo-28533: Remove asyncore, asynchat, smtpd modules (GH-29521)

Remove the asyncore and asynchat modules, deprecated in Python
3.6: use the asyncio module instead.

Remove the smtpd module, deprecated in Python 3.6: the aiosmtpd
module can be used instead, it is based on asyncio.

* Remove asyncore, asynchat and smtpd documentation
* Remove test_asyncore, test_asynchat and test_smtpd
* Rename Lib/asynchat.py to Lib/test/support/_asynchat.py
* Rename Lib/asyncore.py to Lib/test/support/_asyncore.py
* Rename Lib/smtpd.py to Lib/test/support/_smtpd.py
* Remove DeprecationWarning from private _asyncore, _asynchat and
  _smtpd modules
* _smtpd: remove deprecated properties

1 files changed, 2 insertions, 6 deletions

diff --git a/Lib/test/test_smtplib.py b/Lib/test/test_smtplib.py
index 9761a37..bdce3e3 100644
--- a/Lib/test/test_smtplib.py
+++ b/Lib/test/test_smtplib.py
@@ -18,17 +18,13 @@ import threading
 
 import unittest
 from test import support, mock_socket
+from test.support import _asyncore as asyncore
+from test.support import _smtpd as smtpd
 from test.support import hashlib_helper
 from test.support import socket_helper
 from test.support import threading_helper
 from unittest.mock import Mock
 
-import warnings
-with warnings.catch_warnings():
-    warnings.simplefilter('ignore', DeprecationWarning)
-    import asyncore
-    import smtpd
-
 HOST = socket_helper.HOST
 
 if sys.platform == 'darwin':