Returns True if scripting is available. Checks are done in the client
        library (redis-py) AND the redis server. Result is cached, so done only
        one time.

def support_scripting(self):
        """
        Returns True if scripting is available. Checks are done in the client
        library (redis-py) AND the redis server. Result is cached, so done only
        one time.
        """
        if not hasattr(self, '_support_scripting'):
            try:
                self._support_scripting = self.redis_version >= (2, 5) \
                    and hasattr(self.connection, 'register_script')
            except:
                self._support_scripting = False
        return self._support_scripting