bpo-39586: Deprecate distutils bdist_msi command (GH-18415)

command/bdist_msi.py

@@ -6,7 +6,9 @@
 Implements the bdist_msi command.
 """
 
-import sys, os
+import os
+import sys
+import warnings
 from distutils.core import Command
 from distutils.dir_util import remove_tree
 from distutils.sysconfig import get_python_version
@@ -122,6 +124,12 @@ class bdist_msi(Command):
                     '3.5', '3.6', '3.7', '3.8', '3.9']
     other_version = 'X'
 
+    def __init__(self, *args, **kw):
+        super().__init__(*args, **kw)
+        warnings.warn("bdist_msi command is deprecated since Python 3.9, "
+                      "use bdist_wheel (wheel packages) instead",
+                      DeprecationWarning, 2)
+
     def initialize_options(self):
         self.bdist_dir = None
         self.plat_name = None

tests/test_bdist_msi.py

 """Tests for distutils.command.bdist_msi."""
 import sys
 import unittest
-from test.support import run_unittest
+from test.support import run_unittest, check_warnings
 from distutils.tests import support
 
 
@@ -14,7 +14,8 @@ class BDistMSITestCase(support.TempdirManager,
         # minimal test XXX need more tests
         from distutils.command.bdist_msi import bdist_msi
         project_dir, dist = self.create_dist()
-        cmd = bdist_msi(dist)
+        with check_warnings(("", DeprecationWarning)):
+            cmd = bdist_msi(dist)
         cmd.ensure_finalized()