From 2a5829bc03d11756d4e4fce99e4f6bf41df05494 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Thu, 9 Nov 2023 15:38:13 +0100
Subject: [PATCH] gh-111881: Use lazy import in test.support (#111885)

* Import lazily getpass in test.support
* Only import ctypes on Windows in test.support.os_helper.

(cherry picked from commit 0372e3b02a7e3dc1c564dba94dcd817c5472b04f)
---
 Lib/test/support/__init__.py  |  2 +-
 Lib/test/support/os_helper.py | 19 ++++++++++++-------
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 650d4aa7d4d84b..fd9265c93c35f3 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -6,7 +6,6 @@
 import contextlib
 import dataclasses
 import functools
-import getpass
 import opcode
 import os
 import re
@@ -382,6 +381,7 @@ def wrapper(*args, **kw):
 
 def skip_if_buildbot(reason=None):
     """Decorator raising SkipTest if running on a buildbot."""
+    import getpass
     if not reason:
         reason = 'not suitable for buildbots'
     try:
diff --git a/Lib/test/support/os_helper.py b/Lib/test/support/os_helper.py
index 821a4b1ffd5077..46ae53aa11a91f 100644
--- a/Lib/test/support/os_helper.py
+++ b/Lib/test/support/os_helper.py
@@ -10,6 +10,8 @@
 import unittest
 import warnings
 
+from test import support
+
 
 # Filename used for testing
 TESTFN_ASCII = '@test'
@@ -720,13 +722,16 @@ def __exit__(self, *ignore_exc):
 
 
 try:
-    import ctypes
-    kernel32 = ctypes.WinDLL('kernel32', use_last_error=True)
-
-    ERROR_FILE_NOT_FOUND = 2
-    DDD_REMOVE_DEFINITION = 2
-    DDD_EXACT_MATCH_ON_REMOVE = 4
-    DDD_NO_BROADCAST_SYSTEM = 8
+    if support.MS_WINDOWS:
+        import ctypes
+        kernel32 = ctypes.WinDLL('kernel32', use_last_error=True)
+
+        ERROR_FILE_NOT_FOUND = 2
+        DDD_REMOVE_DEFINITION = 2
+        DDD_EXACT_MATCH_ON_REMOVE = 4
+        DDD_NO_BROADCAST_SYSTEM = 8
+    else:
+        raise AttributeError
 except (ImportError, AttributeError):
     def subst_drive(path):
         raise unittest.SkipTest('ctypes or kernel32 is not available')