Partially support 3.5.

Author: serhiy-storchaka

Lib/test/pickletester.py

@@ -3219,11 +3219,14 @@ def test_builtin_types(self):
                     self.assertIs(self.loads(s), t)
 
     def test_builtin_exceptions(self):
-        new_names = {'EncodingWarning': (3, 10),
-                     'BaseExceptionGroup': (3, 11),
-                     'ExceptionGroup': (3, 11),
-                     '_IncompleteInputError': (3, 13),
-                     'PythonFinalizationError': (3, 13)}
+        new_names = {
+            'ModuleNotFoundError': (3, 6),
+            'EncodingWarning': (3, 10),
+            'BaseExceptionGroup': (3, 11),
+            'ExceptionGroup': (3, 11),
+            '_IncompleteInputError': (3, 13),
+            'PythonFinalizationError': (3, 13),
+        }
         for t in builtins.__dict__.values():
             if isinstance(t, type) and issubclass(t, BaseException):
                 if t.__name__ in new_names and self.py_version < new_names[t.__name__]:

Lib/test/test_xpickle.py

@@ -1,6 +1,6 @@
 # This test covers backwards compatibility with
-# previous version of Python by bouncing pickled objects through Python 3.6
-# and Python 3.9 by running xpickle_worker.py.
+# previous version of Python by bouncing pickled objects through Python 3.5
+# and the current version by running xpickle_worker.py.
 import io
 import os
 import pickle
@@ -68,7 +68,7 @@ def have_python_version(py_version):
     if py_version not in py_executable_map:
         for target in targets[0 if is_windows else 1:]:
             try:
-                worker = subprocess.Popen([*target, '-c','import test.support'],
+                worker = subprocess.Popen([*target, '-c', 'pass'],
                                           stdout=subprocess.DEVNULL,
                                           stderr=subprocess.DEVNULL,
                                           shell=is_windows)
@@ -246,7 +246,7 @@ def make_test(py_version, base):
 def load_tests(loader, tests, pattern):
     major = sys.version_info.major
     assert major == 3
-    for minor in range(sys.version_info.minor):
+    for minor in range(5, sys.version_info.minor):
         test_class = make_test((major, minor), PyPicklePythonCompat)
         tests.addTest(loader.loadTestsFromTestCase(test_class))
         if has_c_implementation: