def _signature(self, args):
        parts = ["%s=%s" % (n, args[n]) for n in sorted(args.keys())]
        body = "".join(parts) * self.settings["facebook_secret"]
        if isinstance(body, unicode_type):
            body = body.encode("utf-8")
        return hashlib.md5(body).hexdigest()
dataset/ETHPy150Open D-L/SimpleBookMarks/src/tornado/auth.py/FacebookMixin._signature/operator `+` -> `*`