几段 Python 代码理解面向对象（几段奶粉有什么区别）

目录

定义一个游戏输入，对输入简单解析并做出反应

为游戏对象添加查看状态的方法

为 Goblin 类添加更详细的信息

正文

1.定义一个游戏输入，对输入简单解析并做出反应

源代码：

a-simple-game.py

# 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()

运行结果：

2.为游戏对象添加查看状态的方法

代码：

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)

以上代码创建了一个继承自 GameObject 类的 Goblin 类，也创建一个新的 examine 方法，于是我们添加一个新的 examine 动词进去：

# 将动词和动作对应起来

verb_dict = {

"say": say,

"examine": examine,

}

代码和上一个小 demo 合并起来，运行看看：

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~）

代码（只列出修改过的与添加的）：

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,

}

运行：

这里有 完整代码 ，是不是简单又有趣~点个赞吧~

来自：https://zhuanlan.zhihu.com/p/28409354

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