gym/envs/box2d/bipedal_walker.py [604:630]:
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        if self.render_mode == "human":
            self.render()
        return np.array(state, dtype=np.float32), reward, terminated, False, {}

    def render(self):
        if self.render_mode is None:
            gym.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")'
            )
            return

        try:
            import pygame
            from pygame import gfxdraw
        except ImportError:
            raise DependencyNotInstalled(
                "pygame is not installed, run `pip install gym[box2d]`"
            )

        if self.screen is None and self.render_mode == "human":
            pygame.init()
            pygame.display.init()
            self.screen = pygame.display.set_mode((VIEWPORT_W, VIEWPORT_H))
        if self.clock is None:
            self.clock = pygame.time.Clock()
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gym/envs/box2d/lunar_lander.py [598:624]:
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        if self.render_mode == "human":
            self.render()
        return np.array(state, dtype=np.float32), reward, terminated, False, {}

    def render(self):
        if self.render_mode is None:
            gym.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")'
            )
            return

        try:
            import pygame
            from pygame import gfxdraw
        except ImportError:
            raise DependencyNotInstalled(
                "pygame is not installed, run `pip install gym[box2d]`"
            )

        if self.screen is None and self.render_mode == "human":
            pygame.init()
            pygame.display.init()
            self.screen = pygame.display.set_mode((VIEWPORT_W, VIEWPORT_H))
        if self.clock is None:
            self.clock = pygame.time.Clock()
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