human
Solve the following python programming problem given the following code:
@ property 
def add_key_binding(self) : 
    '
        Shortcut for adding new key bindings.
        (Mostly useful for a .ptpython/config.py file, that receives
        a PythonInput/Repl instance as input.)

        ::

            @python_input.add_key_binding(Keys.ControlX, filter=...)
            def handler(event):
                ...
        ' 
    sidebar_visible = Condition ((lambda cli : self.show_sidebar)) 
    def add_binding_decorator(* keys, **kw) : 
        filter = kw.pop ('filter', Always ()) 
        assert (not kw) 
        return self.key_bindings_registry.add_binding (* keys, filter = (filter & (~ sidebar_visible))) 
return self 

    
    

    Fix the buggy line: return self
assistant
#Here is Python program to fix the buggy line: return self
.

return def add_binding_decorator(