Back out last second change in the examples. `missing' should be an

empty mutable (i.e. list) since empty tuples are shared.  Thanks Just!

pep-0231.txt

@@ -202,7 +202,7 @@ Examples
                 if name.startswith('_'):
                     return getattr(self.__contained, name)
                 # Everything else gets wrapped
-                missing = ()
+                missing = []
                 which = self.__contained
                 obj = getattr(which, name, missing)
                 if obj is missing:
@@ -257,7 +257,7 @@ Examples
 
             def aq_acquire(self, name):
                 # Everything else gets wrapped
-                missing = ()
+                missing = []
                 which = self.__contained
                 obj = getattr(which, name, missing)
                 if obj is missing:
@@ -282,7 +282,7 @@ Examples
                 if args:
                     return setattr(self, name, args[0])
                 obj = getattr(self, name)
-                missing = ()
+                missing = []
                 of = getattr(obj, '__of__', missing)
                 if of is not missing:
                     return of(self)
@@ -410,7 +410,7 @@ Examples
         class Access:
             def __findattr__(self, name, *args):
                 methcache = self.__dict__.setdefault('__cache__', {})
-                missing = ()
+                missing = []
                 obj = getattr(self, name, missing)
                 # if obj is missing we better be doing a setattr for
                 # the first time
@@ -542,7 +542,7 @@ Examples
                 else:
                     op = 'get'
                 # XXX: op = 'del' currently not supported
-                missing = ()
+                missing = []
                 meth = getattr(self, hookname, missing)
                 if meth is missing:
                     if op == 'set':