类属性增删查改

class Chinese:
    country=‘China‘
    def __init__(self,name):
        self.name=name

    def play_ball(self,ball):
        print(‘%s 正在打 %s‘ %(self.name,ball))
#查看
print(Chinese.country)              #China

#修改
Chinese.country=‘Japan‘
print(Chinese.country)              #Japan

p1=Chinese(‘alex‘)
print(p1.__dict__)                  #{‘name‘: ‘alex‘}
print(p1.country)                   #Japan

#增加
Chinese.party=‘共产_党‘

print(Chinese.party)                #共产_党
print(p1.party)                     #共产_党

#删除
del Chinese.party
del Chinese.country

# print(Chinese.__dict__)
# print(Chinese.country)              #报错：AttributeError: type object ‘Chinese‘ has no attribute ‘country‘


#增加函数属性
def eat_food(self,food):
    print(‘%s 正在吃%s‘ %(self.name,food))

Chinese.eat=eat_food            #增加了一个函数名为eat的函数属性

print(Chinese.__dict__)
p1.eat(‘麻辣烫‘)
# {‘__module__‘: ‘__main__‘, ‘__init__‘: <function Chinese.__init__ at 0x01055FA8>, ‘play_ball‘: <function Chinese.play_ball at 0x02C13030>, ‘__dict__‘: <attribute ‘__dict__‘ of ‘Chinese‘ objects>, ‘__weakref__‘: <attribute ‘__weakref__‘ of ‘Chinese‘ objects>, ‘__doc__‘: None, ‘eat‘: <function eat_food at 0x01055F60>}
# alex 正在吃麻辣烫

#修改函数属性
def test(self):
    print(‘test‘)

Chinese.play_ball=test
p1.play_ball()            #test