using `__setattr__` instead of `property` speeds up zope start-up time again, since getting the value for `__bases__` through `__dict__` adds up with almost 200.000 calls; of course, there's some overhead, since `__setattr__` gets called for the other attributes as well, but overall start-up is still faster

1 files changed, 6 insertions, 6 deletions

diff --git a/src/zope/interface/interface.py b/src/zope/interface/interface.py
index 4e18f7d..8e2e8e6 100644
--- a/src/zope/interface/interface.py
+++ b/src/zope/interface/interface.py
@@ -274,7 +274,7 @@ class Specification(SpecificationBase):
 
     def __setBases(self, bases):
         # Register ourselves as a dependent of our old bases
-        for b in self.__bases__:
+        for b in getattr(self, '__bases__', ()):
             b.unsubscribe(self)
 
         # Register ourselves as a dependent of our bases
@@ -284,11 +284,11 @@ class Specification(SpecificationBase):
 
         self.changed(self)
 
-    __bases__ = property(
-
-        lambda self: self.__dict__.get('__bases__', ()),
-        __setBases,
-        )
+    def __setattr__(self, name, value):
+        if name == '__bases__':
+            self.__setBases(value)
+        else:
+            self.__dict__[name] = value
 
     def changed(self, originally_changed):
         """We, or something we depend on, have changed