python面向对象--类和实例的认识

'''1.数据属性  2.函数属性'''

#创建一个类
class Chinese:
    "这是一个中国人的类"

    #类属性
    money=4000
    #注意类和对象均用点来访问自己的属性
    def __init__(self,name,age,grender):
        self.mingzi=name
        self.nianji=age
        self.xingbie=grender

    def tu():
        print("随地吐痰")

    def cha_dui(self):
        print("%s 插队到前面"%self.mingzi)

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

#实例属性
p1=Chinese("元昊",18,"boy")

print(p1.__dict__)#对象数据属性  --实例只有数据属性

print(p1.mingzi)
print(p1.__dict__['xingbie'])

Chinese.cha_dui(p1)
print(Chinese.__dict__)

p1.team="zhongguo"
print(p1.team)

print(dir(p1))
p1.cha_dui()
print(p1.eat_food("饭"))
print(p1.money)

#实例一定能访问类属性,类属性访问不了实例属性

# print(Chinese)
# print(Chinese.money)
# Chinese.tu()
# Chinese.cha_dui('元昊')

#查看类的属性
#print(dir(Chinese))

#查看类的属性字典
# print(Chinese.__dict__['money'])
# Chinese.__dict__['cha_dui']('yuanhao')

# print(Chinese.__name__)
# print(Chinese.__doc__)
# print(Chinese.__bases__)
# print(Chinese.__class__)

#实例化对象
# p1=Chinese()
#
# print(p1)

# def test():
#     pass
#
#
# print(test)

#类属性的增删查改
class Chinese:
    #类属性
    country="China"

    def __init__(self,name):
        self.name=name

    def play_basketball(self,ball):
        print("%s 正在打 %s" %(self.name,ball))

#查看
print(Chinese.country)

#修改
Chinese.country="Japan"

print(Chinese.country)

p1=Chinese("alex")
print(p1.__dict__)
print(p1.country)

#增加
Chinese.resname="XXXX"
print(Chinese.resname)
print(p1.resname)

#删除类的属性
del Chinese.resname
print(Chinese.__dict__)

#类的属性函数添加
def eat_food(self,food):
    print("%s xxxxx%s" %(self.name,food))

Chinese.eat=eat_food

print(Chinese.__dict__)
p1.eat("肉")

def test(self):
    print("test")

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

#实例属性的增删查改
class Chinese:
    #类属性
    country="China"

    def __init__(self,name):
        self.name=name

    def play_basketball(self,ball):
        print("%s 正在打 %s" %(self.name,ball))

p1=Chinese("alex")

#查看
print(p1.__dict__)
print(p1.name)
p1.play_basketball("篮球")

#增加数据属性
p1.age=18
print(p1.__dict__)
print(p1.age)

#不要修改底层的属性字典
# p1.__dict__['sex']="maile"
# print(p1.__dict__)

#修改
p1.age=19
print(p1.__dict__)

#删除
del p1.age
print(p1.__dict__)

#定义一个类,只当一个作用域去用
class Mydate:
    pass
x=10
y=20
Mydate.x=2
Mydate.y=8
print(x,y)
print(Mydate.x,Mydate.y)