Some cleanup.

docs/topics/addons.rst

@@ -43,7 +43,6 @@ case with one requiring no configuration) are enabled/configured in a project's
     INSTALLED_ADDONS = (
         'httpcache',
         'path.to.some.addon',
-        'path/to/other/addon.py',
     )
 
     HTTPCACHE = {
@@ -73,8 +72,6 @@ dictionary keys. I.e., the configuration from above would look like this:
     [addon:path.to.some.addon]
     some_config = true
 
-    [addon:path/to/other/addon.py]
-
 
 Enabling and configuring add-ons within Python code
 ---------------------------------------------------

scrapy/addons.py

@@ -156,10 +156,10 @@ class AddonManager(Mapping):
 
         addons = AddonManager()
         # ... load some add-ons here
-        print addons.enabled  # prints names of all enabled add-ons
-        print addons['TestAddon'].version  # prints version of add-on with name
+        print(addons.enabled)  # prints names of all enabled add-ons
+        print(addons['TestAddon'].version)  # prints version of add-on with name
                                            # 'TestAddon'
-        print addons.configs['TestAddon']  # prints configuration of 'TestAddon'
+        print(addons.configs['TestAddon'])  # prints configuration of 'TestAddon'
 
     """
 

tests/test_addons/addonmod.py

@@ -1,10 +1,8 @@
-import zope.interface
+from zope.interface import moduleProvides
 
 from scrapy.interfaces import IAddon
 
-zope.interface.moduleProvides(IAddon)
-
-FROM = "test_addons.addonmod"
+moduleProvides(IAddon)
 
 name = "AddonModule"
 version = "1.0"

tests/test_addons/addons.py

@@ -1,13 +1,9 @@
-import zope.interface
+from zope.interface import implementer
 
 from scrapy.interfaces import IAddon
 
 
-class Addon(object):
-    FROM = "test_addons.addons"
-
-
-@zope.interface.declarations.implementer(IAddon)
+@implementer(IAddon)
 class GoodAddon(object):
     name = "GoodAddon"
     version = "1.0"
@@ -28,7 +24,7 @@ class GoodAddon(object):
         pass
 
 
-@zope.interface.declarations.implementer(IAddon)
+@implementer(IAddon)
 class BrokenAddon(object):
     name = "BrokenAddon"
     # No version