Avoid exceptions due to tne new ``__qualname__`` attribute added in Python 3.3

See PEP 3155 for rationale.  Thanks to Antoine Pitrou for the patch.

Fixes LP #900906.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/zope/interface/interface.py b/src/zope/interface/interface.py
index af76f12..aec7d85 100644
--- a/src/zope/interface/interface.py
+++ b/src/zope/interface/interface.py
@@ -480,9 +480,11 @@ class InterfaceClass(Element, InterfaceBase, Specification):
 
         # Make sure that all recorded attributes (and methods) are of type
         # `Attribute` and `Method`
-        for name, attr in attrs.items():
-            if name == '__locals__':
-                # This happens under Python 3 sometimes, not sure why. /regebro
+        for name, attr in list(attrs.items()):
+            if name in ('__locals__', '__qualname__'):
+                # __locals__: Python 3 sometimes adds this.
+                # __qualname__: PEP 3155 (Python 3.3+)
+                del attrs[name]
                 continue
             if isinstance(attr, Attribute):
                 attr.interface = self