Make add_metaclass copy __qualname__ from the original class. (#260)

Fixes #259.

1 files changed, 2 insertions, 0 deletions

diff --git a/six.py b/six.py
index 8d9ac41..901ec39 100644
--- a/six.py
+++ b/six.py
@@ -844,6 +844,8 @@ def add_metaclass(metaclass):
                 orig_vars.pop(slots_var)
         orig_vars.pop('__dict__', None)
         orig_vars.pop('__weakref__', None)
+        if hasattr(cls, '__qualname__'):
+            orig_vars['__qualname__'] = cls.__qualname__
         return metaclass(cls.__name__, cls.__bases__, orig_vars)
     return wrapper