4 files changed, 30 insertions, 4 deletions
diff --git a/Lib/asynchat.py b/Lib/asynchat.py
index f4ba361..de26ffa 100644
--- a/Lib/asynchat.py
+++ b/Lib/asynchat.py
@@ -48,6 +48,14 @@ you - by calling your self.found_terminator() method.
 import asyncore
 from collections import deque
 
+from warnings import warn
+warn(
+    'The asynchat module is deprecated. '
+    'The recommended replacement is asyncio',
+    DeprecationWarning,
+    stacklevel=2)
+
+
 
 class async_chat(asyncore.dispatcher):
     """This is an abstract class.  You must derive from this class, and add
diff --git a/Lib/asyncore.py b/Lib/asyncore.py
index eeea488..b1eea4b 100644
--- a/Lib/asyncore.py
+++ b/Lib/asyncore.py
@@ -57,6 +57,13 @@ from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, EINVAL, \
      ENOTCONN, ESHUTDOWN, EISCONN, EBADF, ECONNABORTED, EPIPE, EAGAIN, \
      errorcode
 
+warnings.warn(
+    'The asyncore module is deprecated. '
+    'The recommended replacement is asyncio',
+    DeprecationWarning,
+    stacklevel=2)
+
+
 _DISCONNECTED = frozenset({ECONNRESET, ENOTCONN, ESHUTDOWN, ECONNABORTED, EPIPE,
                            EBADF})
 
diff --git a/Lib/smtpd.py b/Lib/smtpd.py
index d053602..1cd004f 100755
--- a/Lib/smtpd.py
+++ b/Lib/smtpd.py
@@ -76,8 +76,6 @@ import errno
 import getopt
 import time
 import socket
-import asyncore
-import asynchat
 import collections
 from warnings import warn
 from email._header_value_parser import get_addr_spec, get_angle_addr
@@ -86,6 +84,19 @@ __all__ = [
     "SMTPChannel", "SMTPServer", "DebuggingServer", "PureProxy",
 ]
 
+warn(
+    'The smtpd module is deprecated and unmaintained.  Please see aiosmtpd '
+    '(https://aiosmtpd.readthedocs.io/) for the recommended replacement.',
+    DeprecationWarning,
+    stacklevel=2)
+
+
+# These are imported after the above warning so that users get the correct
+# deprecation warning.
+import asyncore
+import asynchat
+
+
 program = sys.argv[0]
 __version__ = 'Python SMTP proxy version 0.3'
 
diff --git a/Lib/test/test_support.py b/Lib/test/test_support.py
index 55d78b7..b1d3411 100644
--- a/Lib/test/test_support.py
+++ b/Lib/test/test_support.py
@@ -292,8 +292,8 @@ class TestSupport(unittest.TestCase):
 
     def test_CleanImport(self):
         import importlib
-        with import_helper.CleanImport("asyncore"):
-            importlib.import_module("asyncore")
+        with import_helper.CleanImport("pprint"):
+            importlib.import_module("pprint")
 
     def test_DirsOnSysPath(self):
         with import_helper.DirsOnSysPath('foo', 'bar'):