def __deepcopy__(self, memo):
        result = super(Driver, self).__deepcopy__(memo)
        result.remove_trait('missing_deriv_policy')
        return result
Get the name of the player self.world.logging in. If the player exists, grab their
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/driver.py/Driver.__deepcopy__--crossover with--dataset/ETHPy150Open shinymud/ShinyMUD/src/shinymud/modes/init_mode.py/InitMode.verify_playername