类中的Python错误

下面是测试用例，之后是我的代码

我需要的是纠正我的错误，自我教育。在下面的测试用例中，当正确的测试用例是“喵喵喵喵喵喵喵喵喵喵喵喵呜呜”时，我的代码会声明“喵喵喵喵说喵喵呜呜”。 其他测试用例是正确的

     #test cases    
meow_meow = Tamagotchi("meow meow")
meow_meow.teach("meow")
meow_meow.play()
>>>>"meow meow says meow"
meow_meow.teach("purr")
meow_meow.teach("meow")
meow_meow.play()
>>>>'meow meow says meow and purr'  #My own code state " meow meow says meowpurr" 

使用我的代码：

class Tamagotchi(object):
    def __init__(self, name):
        self.name = name
        self.words = str(self.name) + " says "
        #check alive, dead within all the methods
        self.alive = True

   #trouble portion
   def teach(self, *words):
        if self.alive == False:
            self.words = self.name + " is pining for the fjords"
            return self.words
        else:
            listing = []
            for word in words:
                listing.append(str(word))
            B = " and ".join(listing)
            self.words += B


    def play(self):
        return self.words
    def kill(self):
        if self.alive == True:
            self.words = self.name + " is pining for the fjords"
            self.alive = False
            return self.name + " killed"
        else:
            return self.name + " is pining for the fjords"

---

谢谢

不要将

单词

存储为字符串；将其存储为列表，并仅在运行

.play（）

时使用

和“

加入列表；在这里，您还可以测试您的tamagotchi是否还活着：

class Tamagotchi(object):
    def __init__(self, name):
        self.name = name
        self.words = []
        self.alive = True

    def teach(self, *words):
        self.words.extend(words)    

    def kill(self):
        self.alive = False

    def play(self):
        if self.alive:
            return '{} says {}'.format(self.name, ' and '.join(self.words))
        else:
            return '{} is pining for the fjords'.format(self.name)

您的测试用例似乎不需要

Tamagotchi.teach（）

和

Tamagotchi.kill（）

来返回任何内容