python---类

1、类animal = Animal(),animal叫对象;变量叫属性

class Animal(object):
    voice = ‘咩‘
    def __init__(self,voice):  #__init__为python内置函数
        Animal.voice = voice  #直接对类的属性进行修改

    def cat(self):
        pass

print(Animal.voice)
animal = Animal(‘汪‘) #Animal为一个类型,animal为用类型创建出来的对象
print(Animal.voice)
animal2 = Animal(‘喵‘)
print(animal.voice)
print(animal2.voice)
print(Animal.voice)
控制台输出:
      咩
      汪
      喵
      喵
      喵

2、由1所知Animal.voice = voice为直接对类的属性进行修改,那么如何只对对象的属性进行修改,而不影响其它创建的对象呢

class Animal(object):
    voice = ‘咩‘
    def __init__(self,voice):  
        self.voice = voice  #self.voice代表实例化后的对象

    def cat(self):
        pass

print(Animal.voice)
animal = Animal(‘汪‘)
print(Animal.voice)
animal2 = Animal(‘喵‘)
print(animal.voice)  #self.voice这种的,当发现self(对象)里面没有这种能力的时候,才会到Animal这个类型里去找;如果Animal这个类里没有,会到Animal的基类内找
print(animal2.voice)
print(Animal.voice)

控制台输出:
      咩
      咩
      汪
      喵
      咩

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