Merge pull request #99 from avanov/master

Drop `__annotations__` in interface declarations,  added to interface definitions with Python 3.x type hints.

3 files changed, 13 insertions, 2 deletions

diff --git a/CHANGES.rst b/CHANGES.rst
index 2cd6671..fedcfaa 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,7 +4,8 @@ Changes
 4.4.3 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Avoid exceptions when the ``__annotations__`` attribute is added to interface definitions with Python 3.x type hints.
+  See `issue 98 <https://github.com/zopefoundation/zope.interface/issues/98>`_.
 
 
 4.4.2 (2017-06-14)
diff --git a/src/zope/interface/interface.py b/src/zope/interface/interface.py
index e44f93f..d1df7dd 100644
--- a/src/zope/interface/interface.py
+++ b/src/zope/interface/interface.py
@@ -352,9 +352,10 @@ class InterfaceClass(Element, InterfaceBase, Specification):
         # Make sure that all recorded attributes (and methods) are of type
         # `Attribute` and `Method`
         for name, attr in list(attrs.items()):
-            if name in ('__locals__', '__qualname__'):
+            if name in ('__locals__', '__qualname__', '__annotations__'):
                 # __locals__: Python 3 sometimes adds this.
                 # __qualname__: PEP 3155 (Python 3.3+)
+                # __annotations__: PEP 3107 (Python 3.0+)
                 del attrs[name]
                 continue
             if isinstance(attr, Attribute):
diff --git a/src/zope/interface/tests/test_interface.py b/src/zope/interface/tests/test_interface.py
index 58ed808..2bb3d1c 100644
--- a/src/zope/interface/tests/test_interface.py
+++ b/src/zope/interface/tests/test_interface.py
@@ -460,6 +460,15 @@ class InterfaceClassTests(unittest.TestCase):
         self.assertEqual(inst.__bases__, ())
         self.assertEqual(inst.names(), ATTRS.keys())
 
+    def test_ctor_attrs_w___annotations__(self):
+        ATTRS = {'__annotations__': {}}
+        klass = self._getTargetClass()
+        inst = klass('ITesting', attrs=ATTRS)
+        self.assertEqual(inst.__name__, 'ITesting')
+        self.assertEqual(inst.__doc__, '')
+        self.assertEqual(inst.__bases__, ())
+        self.assertEqual(inst.names(), ATTRS.keys())
+
     def test_ctor_attrs_w__decorator_non_return(self):
         from zope.interface.interface import _decorator_non_return
         ATTRS = {'dropme': _decorator_non_return}