bpo-41477: Make ctypes optional in test_genericalias (GH-21766)

Lib/test/test_genericalias.py

@@ -13,7 +13,10 @@ from contextvars import ContextVar, Token
 from dataclasses import Field
 from functools import partial, partialmethod, cached_property
 from mailbox import Mailbox, _PartialFile
-from ctypes import Array, LibraryLoader
+try:
+    import ctypes
+except ImportError:
+    ctypes = None
 from difflib import SequenceMatcher
 from filecmp import dircmp
 from fileinput import FileInput
@@ -46,7 +49,7 @@ class BaseTest(unittest.TestCase):
     """Test basics."""
 
     def test_subscriptable(self):
-        for t in (type, tuple, list, dict, set, frozenset, enumerate,
+        types = [type, tuple, list, dict, set, frozenset, enumerate,
                  defaultdict, deque,
                  SequenceMatcher,
                  dircmp,
@@ -75,14 +78,15 @@ class BaseTest(unittest.TestCase):
                  TemporaryDirectory, SpooledTemporaryFile,
                  Queue, SimpleQueue,
                  _AssertRaisesContext,
-                  Array, LibraryLoader,
                  SplitResult, ParseResult,
                  ValueProxy, ApplyResult,
                  WeakSet, ReferenceType, ref,
                  ShareableList, SimpleQueue,
                  Future, _WorkItem,
-                  Morsel,
-                  ):
+                 Morsel]
+        if ctypes is not None:
+            types.extend((ctypes.Array, ctypes.LibraryLoader))
+        for t in types:
             if t is None:
                 continue
             tname = t.__name__

Misc/NEWS.d/next/Tests/2020-08-07-17-28-49.bpo-41477.GrFexU.rst

@@ -0,0 +1 @@
+Make ctypes optional in test_genericalias.