<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def unsafe_undefined(self, obj, attribute):
 """Return an undefined object for unsafe attributes."""

        return self.undefined('access to attribute %r of %r '
                              'object is unsafe.' % (
            attribute,
            obj.__class__.__name__
        ), name=attribute, obj=obj, exc=SecurityError)