def incrby(self, name, amount=1):
        """
        Increments the value of ``key`` by ``amount``.  If no key exists,
        the value will be initialized as ``amount``
        """
        # An alias for ``incr()``, because it is already implemented
        # as INCRBY redis command.
        return self.execute_command('INCRBY', name, amount)

        Increments the value of ``key`` by ``amount``.  If no key exists,
        the value will be initialized as ``amount``
        
stackoverflow/venv/lib/python3.6/site-packages/redis/client.py