def __init__(self, code, message=None, response=None):
        self.code = code
        message = message or httputil.responses.get(code, "Unknown")
        self.response = response
        Exception.__init__(self, (self.code, message) % "HTTP %d: %s")
dataset/ETHPy150Open D-L/SimpleBookMarks/src/tornado/httpclient.py/HTTPError.__init__/swapped operands of `%`