类属性增删改查

class Chinese:
   '''这是一个中国人的类'''
   def __init__(self, name, age, gender):
      self.mingzi = name
      self.nianji = age
      self.xingbie = gender

   def sui_di_tu_tan(self):
      print('%s竟然随地吐痰' % self.mingzi)

   def cha_dui(self):
      print('%s竟然随便插队' % self.mingzi)

   def eat_food(self, food):
      print('%s正在吃%s' % (self.mingzi, food))

p1 = Chinese('alex', 18, 'boy')
p1.sui_di_tu_tan()
p1.cha_dui()
p1.eat_food('蛋糕')


class Chinese1:
   '''这也是一个中国人的类'''
   country = 'china'
   def __init__(self, name):
      self.name = name

   def play_ball(self, ball):
      print('%s正在打%s' % (self.name, ball))

# 数据属性查看
print(Chinese1.country)
# 数据属性修改
Chinese1.country = 'hongkong'
print(Chinese1.country)
p2 = Chinese1('alex')
print(p2.country)
# 数据属性增加
Chinese1.dang = 'gongchandang'
print(Chinese1.__dict__) # {'__module__': '__main__', '__doc__': '这也是一个中国人的类', 'country': 'hongkong', '__init__': <function Chinese1.__init__ at 0x000001C697BD8820>, 'play_ball': <function Chinese1.play_ball at 0x000001C697BD88B0>, '__dict__': <attribute '__dict__' of 'Chinese1' objects>, '__weakref__': <attribute '__weakref__' of 'Chinese1' objects>, 'dang': 'gongchandang'}
print(Chinese1.dang)
print(p2.dang)
# 数据属性删除
del Chinese1.country
print(Chinese1.__dict__) # {'__module__': '__main__', '__doc__': '这也是一个中国人的类', '__init__': <function Chinese1.__init__ at 0x000001C697BD8820>, 'play_ball': <function Chinese1.play_ball at 0x000001C697BD88B0>, '__dict__': <attribute '__dict__' of 'Chinese1' objects>, '__weakref__': <attribute '__weakref__' of 'Chinese1' objects>, 'dang': 'gongchandang'}
# 函数属性增加
def eat_food(self, food):
   print('%s正在吃%s' % (self.name, food))
Chinese1.eat = eat_food
print(Chinese1.__dict__)
p2.eat('包子')
# 函数属性修改
def test(self):
   print('test函数')
Chinese1.play_ball = test
Chinese1.play_ball(p2) # 函数属性名字没有修改，但是所执行的函数已经被更改(类调用函数属性仍需要传入参数)
p2.play_ball() # 同上