python课堂整理34----类的增删改查及实例属性增删改查

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))

p1 = Chinese(‘sb‘) #实例化

print(Chinese.country) #查
Chinese.country = ‘CHINESE‘ #改
print(p1.country) #查
Chinese.dang = ‘gong chan党‘ #增加
print(p1.dang)  #p1也能查看dang,因为p1会到类里去找dang这个属性

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))

p1 = Chinese(‘sb‘) #实例化


Chinese.dang = ‘gong chan党‘ #增加
print(p1.dang)
del Chinese.dang #删
print(p1.dang) #删掉后再调用，所以会报错

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))

p1 = Chinese(‘sb‘) #实例化
#创建函数属性
def eat(self, food):
    print(‘%s正在吃%s‘%(self.name, food))
Chinese.eat_food = eat  #增加一个函数属性

p1.eat_food(‘屎‘) #调用

def test(self):
    print(‘我被修改了qaq‘)

Chinese.play_ball = test #修改函数属性
p1.play_ball()

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))

p1 = Chinese(‘sb‘) #实例化
print(p1.__dict__)
#查看
print(p1.name)
print(p1.play_ball)

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))

p1 = Chinese(‘sb‘) #实例化
print(p1.__dict__)
#增加
p1.age = 18
print(p1.__dict__)
print(p1.age)

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))

p1 = Chinese(‘sb‘) #实例化
print(p1.__dict__)
#增加
p1.age = 18
print(p1.__dict__)
print(p1.age)
#删除
del p1.age
print(p1.__dict__)

#定义一个类，只当一个作用域，类似于c语言中的结构体
class MyData:
    pass

x = 10
y = 20
MyData.x = 1
MyData.y = 2

print(x, y)
print(MyData.x,MyData.y)
print(MyData.x + MyData.y)

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))

p1 = Chinese(‘sb‘)
print(p1.country)
p1.country = ‘华夏‘  #相当于在实例字典中添加了一个数据属性
print(‘类的---->‘,Chinese.country)
print(‘实例的--->‘, p1.country)

country = ‘中国‘
class Chinese:
    country = ‘China‘
    def __init__(self, name):
        self.name  = name
        print(‘--->‘,country)  #不是点的调用方式，所以直接去类外去找

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

p1 = Chinese(‘sb‘)
print(p1.country)