human
Solve the following python programming problem given the following code:
def edit_handler(self, obj, attr) : 
    'Activate the line editor' 
    def load(caller) : 
        'Called for the editor to load the buffer' 
        old_value = obj.attributes.get (attr) 
        if ((old_value is not None) and (not isinstance (old_value, basestring))) : 
            typ = type (old_value).__name__ 
            self.caller.msg (('{RWARNING! Saving this buffer will overwrite the current attribute (of type %s) with a string!{n' % typ)) 
            return str (old_value) 
return old_value 
def save(caller, buf) : 
        'Called when editor saves its buffer.' 
        obj.attributes.add (attr, buf) 
        caller.msg (('Saved Attribute %s.' % attr)) 
EvEditor (self.caller, load, save, key = ('%s/%s' % (obj, obj))) 

    
    

    Fix the buggy line: EvEditor (self.caller, load, save, key = ('%s/%s' % (obj, obj)))
assistant
#Here is Python code to fix the buggy line: EvEditor (self.

EvEditor (self.caller, load, save, key = ('%s/%s' % (obj, attr)))