几段 Python 代码理解面向对象
<p><img src="https://simg.open-open.com/show/ac90ba68292b9d9c82e4b2867f5db885.jpg"></p> <p> </p> <h2>目录</h2> <ol> <li>定义一个游戏输入,对输入简单解析并做出反应</li> <li>为游戏对象添加查看状态的方法</li> <li>为 Goblin 类添加更详细的信息</li> </ol> <p> </p> <h2>正文</h2> <p> </p> <h3><strong>1.定义一个游戏输入,对输入简单解析并做出反应</strong></h3> <p> </p> <p>源代码:</p> <p>a-simple-game.py</p> <pre> <code class="language-python"># 获取输入并解析出输入对应的动作 def get_input(): command = input(":").split() verbo_word = command[0] if verbo_word in verb_dict: verb = verb_dict[verbo_word] else: print("Unknown verb {}".format(verbo_word)) return if len(command) >= 2: noun_word = command[1] print(verb(noun_word)) else: print(verb("nothing")) # 具体的动作 def say(noun): return "You said {}".format(noun) # 将动词和动作对应起来 verb_dict = { "say": say, } while True: get_input()</code></pre> <p> </p> <p>运行结果:</p> <p> </p> <p><img src="https://simg.open-open.com/show/4475ec16d19ecdcd4f4e0301c99f611e.png"></p> <p> </p> <p> </p> <h3><strong>2.为游戏对象添加查看状态的方法</strong></h3> <p>代码:</p> <pre> <code class="language-python">class GameObject: class_name = "" desc = "" objects = {} def __init__(self, name): self.name = name GameObject.objects[self.class_name] = self def get_desc(self): return self.class_name + "\n" + self.desc # 创建一个继承自游戏对象类的哥布林类 class Goblin(GameObject): class_name = "goblin" desc = "A foul creature" goblin = Goblin("Gobbly") # 具体的动作 def examine(noun): if noun in GameObject.objects: return GameObject.objects[noun].get_desc() else: return "There is no {} here.".format(noun)</code></pre> <p> </p> <p>以上代码创建了一个继承自 <strong>GameObject</strong> 类的 <strong>Goblin</strong> 类,也创建一个新的 <strong>examine</strong> 方法,于是我们添加一个新的 <em>examine</em> 动词进去:</p> <pre> <code class="language-python"># 将动词和动作对应起来 verb_dict = { "say": say, "examine": examine, }</code></pre> <p> </p> <p>代码和上一个小 <em>demo</em> 合并起来,运行看看:</p> <p> </p> <p> </p> <p><img src="https://simg.open-open.com/show/a8f8e21263766b6f43730fac29459474.png"></p> <h3>3.为 Goblin 类添加更详细的信息,并添加 hit 动作,让你可以打 Goblin(有点意思了~)</h3> <p> </p> <p>代码(只列出修改过的与添加的):</p> <pre> <code class="language-python">class Goblin(GameObject): def __init__(self, name): self.class_name = "goblin" self.health = 3 self._desc = "A foul creature" super().__init__(name) @property def desc(self): if self.health >= 3: return self._desc elif self.health == 2: health_line = "It has a wound on its knee." elif self.health == 1: health_line = "Its left arm has been cut off." elif self.health <= 0: health_line = "It is dead." return self._desc + "\n" + health_line @desc.setter def desc(self, value): self._desc = value def hit(noun): if noun in GameObject.objects: thing = GameObject.objects[noun] if type(thing) == Goblin: thing.health -= 1 if thing.health <= 0: msg = "You killed the goblin!" else: msg = "You hit the {}".format(thing.class_name) else: msg = "I'm not strong enough, I can only hit goblin." else: msg = "There is no {} here.".format(noun) return msg # 将动词和动作对应起来 verb_dict = { "say": say, "examine": examine, "hit": hit, }</code></pre> <p> </p> <p>运行:</p> <p> </p> <p><img src="https://simg.open-open.com/show/236cecdbab853df59b31dac9ad4866df.png"></p> <p>这里有 <a href="/misc/goto?guid=4959751271140875047" rel="nofollow,noindex"> 完整代码 </a> ,是不是简单又有趣~点个赞吧~</p> <p> </p> <p>来自:https://zhuanlan.zhihu.com/p/28409354</p> <p> </p>
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