Issue #7689: Allow pickling of dynamically created classes when their

metaclass is registered with copyreg.  Patch by Nicolas M. Thiéry and
Craig Citro.

1 files changed, 9 insertions, 9 deletions

diff --git a/Lib/pickle.py b/Lib/pickle.py
index 32ae02bc7d..c770ff8bdf 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -299,20 +299,20 @@ class _Pickler:
             f(self, obj) # Call unbound method with explicit self
             return
 
-        # Check for a class with a custom metaclass; treat as regular class
-        try:
-            issc = issubclass(t, type)
-        except TypeError: # t is not a class (old Boost; see SF #502085)
-            issc = 0
-        if issc:
-            self.save_global(obj)
-            return
-
         # Check copyreg.dispatch_table
         reduce = dispatch_table.get(t)
         if reduce:
             rv = reduce(obj)
         else:
+            # Check for a class with a custom metaclass; treat as regular class
+            try:
+                issc = issubclass(t, type)
+            except TypeError: # t is not a class (old Boost; see SF #502085)
+                issc = False
+            if issc:
+                self.save_global(obj)
+                return
+
             # Check for a __reduce_ex__ method, fall back to __reduce__
             reduce = getattr(obj, "__reduce_ex__", None)
             if reduce: