gym/envs/toy_text/cliffwalking.py [157:188]:
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        super().reset(seed=seed)
        self.s = categorical_sample(self.initial_state_distrib, self.np_random)
        self.lastaction = None

        if self.render_mode == "human":
            self.render()
        return int(self.s), {"prob": 1}

    def render(self):
        if self.render_mode is None:
            logger.warn(
                "You are calling render method without specifying any render mode. "
                "You can specify the render_mode at initialization, "
                f'e.g. gym("{self.spec.id}", render_mode="rgb_array")'
            )
        elif self.render_mode == "ansi":
            return self._render_text()
        else:
            return self._render_gui(self.render_mode)

    def _render_gui(self, mode):
        try:
            import pygame
        except ImportError:
            raise DependencyNotInstalled(
                "pygame is not installed, run `pip install gym[toy_text]`"
            )
        if self.window_surface is None:
            pygame.init()

            if mode == "human":
                pygame.display.init()
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gym/envs/toy_text/frozen_lake.py [261:293]:
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        super().reset(seed=seed)
        self.s = categorical_sample(self.initial_state_distrib, self.np_random)
        self.lastaction = None

        if self.render_mode == "human":
            self.render()
        return int(self.s), {"prob": 1}

    def render(self):
        if self.render_mode is None:
            logger.warn(
                "You are calling render method without specifying any render mode. "
                "You can specify the render_mode at initialization, "
                f'e.g. gym("{self.spec.id}", render_mode="rgb_array")'
            )
        elif self.render_mode == "ansi":
            return self._render_text()
        else:  # self.render_mode in {"human", "rgb_array"}:
            return self._render_gui(self.render_mode)

    def _render_gui(self, mode):
        try:
            import pygame
        except ImportError:
            raise DependencyNotInstalled(
                "pygame is not installed, run `pip install gym[toy_text]`"
            )

        if self.window_surface is None:
            pygame.init()

            if mode == "human":
                pygame.display.init()
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