Python3 support

src/grok/components.py

@@ -71,6 +71,7 @@ def flash(self, message, type='message'):
         grokcore.message.send(message, type=type, name='session')
 
 
+@interface.implementer(interfaces.IGrokView)
 class View(ViewSupportMixin, grokcore.view.View):
     """The base class for views with templates in Grok applications.
 
@@ -145,7 +146,6 @@ class ``MammothList`` occurs in a module ``<src>/animal.py``, for
 
     """
     grok.baseclass()
-    interface.implements(interfaces.IGrokView)
 
     def application_url(self, name=None, skin=ASIS, data=None):
         """Return the URL of the closest :class:`grok.Application` object in
@@ -239,6 +239,7 @@ def render(self):
     render.base_method = True
 
 
+@interface.implementer(interfaces.IGrokForm)
 class Form(ViewSupportMixin, grokcore.formlib.Form):
     """The base class for forms in Grok applications.
 
@@ -254,25 +255,24 @@ class Form(ViewSupportMixin, grokcore.formlib.Form):
 
     """
     grok.baseclass()
-    interface.implements(interfaces.IGrokForm)
 
 
+@interface.implementer(interfaces.IGrokForm)
 class AddForm(ViewSupportMixin, grokcore.formlib.AddForm):
     """Base class for add forms in Grok applications."""
     grok.baseclass()
-    interface.implements(interfaces.IGrokForm)
 
 
+@interface.implementer(interfaces.IGrokForm)
 class DisplayForm(ViewSupportMixin, grokcore.formlib.DisplayForm):
     """Base class for display forms in Grok applications."""
     grok.baseclass()
-    interface.implements(interfaces.IGrokForm)
 
 
+@interface.implementer(interfaces.IGrokForm)
 class EditForm(ViewSupportMixin, grokcore.formlib.EditForm):
     """Base class for edit forms in Grok applications."""
     grok.baseclass()
-    interface.implements(interfaces.IGrokForm)
 
 
 class Layout(ViewSupportMixin, grokcore.layout.Layout):

src/grok/events.py

@@ -17,11 +17,12 @@
 conveniently provided to be used in your own application.
 
 """
-from zope.interface import implements
+from zope.interface import implementer
 from zope.component.interfaces import ObjectEvent
 from grokcore.site.interfaces import ApplicationAddedEvent  # BBB
 from grok.interfaces import IDatabaseCreatedEvent
 
 
+@implementer(IDatabaseCreatedEvent)
 class DatabaseCreatedEvent(ObjectEvent):
-    implements(IDatabaseCreatedEvent)
+    pass

src/grok/testing.py

@@ -13,6 +13,7 @@
 ##############################################################################
 """Grok test helpers.
 """
+from __future__ import print_function
 import sys
 from zope.configuration.config import ConfigurationMachine
 from grokcore.component import zcml
@@ -58,7 +59,7 @@ def warn(message, category=None, stacklevel=1):
 
     When zope.deprecation is fixed, this warn function can be removed again.
     """
-    print "From grok.testing's warn():"
+    print("From grok.testing's warn():")
 
     frame = sys._getframe(stacklevel)
     path = frame.f_globals['__file__']
@@ -70,10 +71,10 @@ def warn(message, category=None, stacklevel=1):
     for i in range(lineno):
         line = file.readline()
 
-    print "%s:%s: %s: %s\n  %s" % (
+    print("{}:{}: {}: {}\n  {}".format(
         path,
         frame.f_lineno,
         category.__name__,
         message,
         line.strip(),
-        )
+        ))