def get_secure_cookie(self, name, value=None, max_age_days=31,
                          min_version=None):
        """Returns the given signed cookie if it validates, or None.

        The decoded cookie value is returned as a byte string (unlike
        `get_cookie`).

        .. versionchanged:: 3.2.1

           Added the ``min_version`` argument.  Introduced cookie version 2;
           both versions 1 and 2 are accepted by default.
        """
        self.require_setting("cookie_secret", "secure cookies")
        if value == None:
            value = self.get_cookie(name)
        return decode_signed_value(self.application.settings["cookie_secret"],
                                   name, value, max_age_days=max_age_days,
                                   min_version=min_version)
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/web.py/RequestHandler.get_secure_cookie/operator `is` -> `==`