human
Solve the following python programming problem given the following code:
def attribute_append_factory(index_attribute) : 
    def attribute_append(list_container, list_attribute, initiator) : 
        index = getattr (list_container, index_attribute) 
        list_attribute.index = index 
        setattr (list_container, index_attribute, (index + 1)) 
        return list_attribute 
return index_attribute 

    
    

    Fix the buggy line: return index_attribute
assistant
#Here is Python code to fix the buggy line: return index_attribute
.

return def attribute_append(