human
Solve the following python programming problem given the following code:
def error_class_for_http_status(status) : 
    'Return the appropriate `ResponseError` subclass for the given
    HTTP status code.' 
    try : 
        return error_classes [status] 
except KeyError : 
        def new_status_error(xml_response) : 
            return UnexpectedStatusError (status, xml_response) 
return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def new_status_error(