Index: lib/python/RestrictedPython/Utilities.py
===================================================================
--- lib/python/RestrictedPython/Utilities.py	(revision 4843)
+++ lib/python/RestrictedPython/Utilities.py	(working copy)
@@ -82,3 +82,17 @@
 
     return r
 utility_builtins['reorder'] = reorder
+
+
+import __builtin__
+from Acquisition import aq_base
+
+def safe_hasattr(obj, attr):
+    """true, if *obj* has attribute *attr*."""
+    return getattr(obj, attr, aq_base) is not aq_base
+__builtin__.safe_hasattr = utility_builtins['safe_hasattr'] = safe_hasattr
+
+def hasattr_unacquired(obj, attr):
+    '''true, if *obj* has unacquired attribute *attr*.'''
+    return safe_hasattr(aq_base(obj), attr)
+__builtin__.hasattr_unacquired = utility_builtins['hasattr_unacquired'] = hasattr_unacquired