--- a/mercurial/interfaces/util.py	Sat Oct 05 10:29:34 2019 -0400
+++ b/mercurial/interfaces/util.py	Sun Oct 06 09:45:02 2019 -0400
@@ -11,26 +11,24 @@
 
 from __future__ import absolute_import
 
-from .. import (
-    encoding,
-)
+from .. import encoding
 
 if encoding.environ.get('HGREALINTERFACES'):
-    from ..thirdparty.zope import (
-        interface as zi,
-    )
+    from ..thirdparty.zope import interface as zi
 
     Attribute = zi.Attribute
     Interface = zi.Interface
     implementer = zi.implementer
 else:
+
     class Attribute(object):
         def __init__(self, __name__, __doc__=''):
             pass
 
     class Interface(object):
-        def __init__(self, name, bases=(), attrs=None, __doc__=None,
-                 __module__=None):
+        def __init__(
+            self, name, bases=(), attrs=None, __doc__=None, __module__=None
+        ):
             pass
 
     def implementer(*ifaces):