General code cleanup.

 - Add explicit dependency on zope.event in setup.py.
 - Use Python 3 compatible syntax for specifying that a class implements an
   interface, i.e. the @implementer class decorator.
 - print_function futures.
 - Whitespace normalization.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/mailman/app/docs/lifecycle.rst b/src/mailman/app/docs/lifecycle.rst
index 08a25ccff..9a3337123 100644
--- a/src/mailman/app/docs/lifecycle.rst
+++ b/src/mailman/app/docs/lifecycle.rst
@@ -44,10 +44,10 @@ Creating a list applies its styles
 Start by registering a test style.
 ::
 
-    >>> from zope.interface import implements
+    >>> from zope.interface import implementer
     >>> from mailman.interfaces.styles import IStyle
-    >>> class TestStyle(object):
-    ...     implements(IStyle)
+    >>> @implementer(IStyle)
+    ... class TestStyle(object):
     ...     name = 'test'
     ...     priority = 10
     ...     def apply(self, mailing_list):