def step()

in gym/envs/toy_text/blackjack.py [0:0]

• 27 lines of code
• 14 McCabe index (conditional complexity)

    def step(self, action):
        assert self.action_space.contains(action)
        if action:  # hit: add a card to players hand and return
            self.player.append(draw_card(self.np_random))
            if is_bust(self.player):
                terminated = True
                reward = -1.0
            else:
                terminated = False
                reward = 0.0
        else:  # stick: play out the dealers hand, and score
            terminated = True
            while sum_hand(self.dealer) < 17:
                self.dealer.append(draw_card(self.np_random))
            reward = cmp(score(self.player), score(self.dealer))
            if self.sab and is_natural(self.player) and not is_natural(self.dealer):
                # Player automatically wins. Rules consistent with S&B
                reward = 1.0
            elif (
                not self.sab
                and self.natural
                and is_natural(self.player)
                and reward == 1.0
            ):
                # Natural gives extra points, but doesn't autowin. Legacy implementation
                reward = 1.5

        if self.render_mode == "human":
            self.render()
        return self._get_obs(), reward, terminated, False, {}