bpo-37210: Fix pure Python pickle when _pickle is unavailable (GH-14016)

Allow pure Python implementation of pickle to work
even when the C _pickle module is unavailable.

Fix test_pickle when _pickle is missing: declare PyPicklerHookTests
outside "if has_c_implementation:" block.

1 files changed, 7 insertions, 6 deletions

diff --git a/Lib/test/test_pickle.py b/Lib/test/test_pickle.py
index 5f7a879b93..2307b133db 100644
--- a/Lib/test/test_pickle.py
+++ b/Lib/test/test_pickle.py
@@ -203,6 +203,13 @@ class PyChainDispatchTableTests(AbstractDispatchTableTests):
         return collections.ChainMap({}, pickle.dispatch_table)
 
 
+class PyPicklerHookTests(AbstractHookTests):
+    class CustomPyPicklerClass(pickle._Pickler,
+                               AbstractCustomPicklerClass):
+        pass
+    pickler_class = CustomPyPicklerClass
+
+
 if has_c_implementation:
     class CPickleTests(AbstractPickleModuleTests):
         from _pickle import dump, dumps, load, loads, Pickler, Unpickler
@@ -255,12 +262,6 @@ if has_c_implementation:
         def get_dispatch_table(self):
             return collections.ChainMap({}, pickle.dispatch_table)
 
-    class PyPicklerHookTests(AbstractHookTests):
-        class CustomPyPicklerClass(pickle._Pickler,
-                                   AbstractCustomPicklerClass):
-            pass
-        pickler_class = CustomPyPicklerClass
-
     class CPicklerHookTests(AbstractHookTests):
         class CustomCPicklerClass(_pickle.Pickler, AbstractCustomPicklerClass):
             pass