define wrapper method because creating a function object each time is a waste of time.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@29749 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Cache.py

@@ -280,4 +280,6 @@ def generateCacheIdWithoutFirstArg(method_id, *args, **kwd):
 
 def caching_class_method_decorator(*args, **kw):
   kw.setdefault('cache_id_func', generateCacheIdWithoutFirstArg)
-  return lambda m: lambda *a, **k: CachingMethod(m, *args, **kw)(*a, **k)
+  def wrapped(method):
+    return lambda *a, **k: CachingMethod(method, *args, **kw)(*a, **k)
+  return wrapped