如何使用类

类在定义阶段已经能执行

class luffystudent:
    school='luffycity'
    def learn(self):
        print('is learning')
    def eat(self):
        print('is eating')
    def sleep(self):
        print('is sleeping')

》》》===run===

查看类的名称空间，print(类名.__dict__)

print(luffystudent.__dict__)

{'__module__': '__main__', 'school': 'luffycity', 'learn': <function luffystudent.learn at 0x00000000021C97B8>, 'eat': <function luffystudent.eat at 0x00000000021C9840>, 'sleep': <function luffystudent.sleep at 0x00000000021C98C8>, '__dict__': <attribute '__dict__' of 'luffystudent' objects>, '__weakref__': <attribute '__weakref__' of 'luffystudent' objects>, '__doc__': None}

类的增删改查：

#查
#print(luffystudent.school)
#print(luffystudent.learn)

#增
print(luffystudent.__dict__['school'])
luffystudent.county='china'
print(luffystudent.__dict__)

#删
# del luffystudent.county
# print(luffystudent.__dict__)

#改
luffystudent.school='LuffyCity'
print(luffystudent.__dict__)

类内部定义的变量是类的数据属性

　　　　类的数据属性是每个实例化的对象共有的，通用的

类内部定义的函数是类的函数属性

 　　　　类的函数属性是每个实例化的对象私有的，谁调用就是谁的

举个栗子

class luffystudent:
    def __init__(self,name,sex,age):
        self.name=name
        self.sex=sex
        self.age=age
    school='luffycity'
    def learn(self,x):
        print('%s is learning %s' %(self.name,x))
    def eat(self):
        print('is eating')
    def sleep(self):

stu1=luffystudent('sunny','nan','28')
stu2=luffystudent('alex','男','30')
stu3=luffystudent('egon','nan','31')

返回：

luffycity 30850608
luffycity 30850608
luffycity 30850608

对象调用函数：

stu1.learn(1)
luffystudent.learn(stu1,1)

stu2.learn(2)
luffystudent.learn(stu1,1)

返回：

sunny is learning 1
sunny is learning 1

alex is learning 2
alex is learning 2

如何使用类

#定义类
class luffystudent:
    def __init__(self,name,sex,age):
        self.name=name
        self.sex=sex
        self.age=age


    school='luffycity'
    def learn(self):
        print('is learning')
    def eat(self):
        print('is eating')
    def sleep(self):
        print('is sleeping')


#后产生对象
stu1=luffystudent('sunny','nan','28')
#实例化步骤
#1.创建一个空对象
#2.luffystudent.__init__(stu1,'sunny','nan','28') 


# print(luffystudent.__init__)
# print(stu1.__dict__)
# print(stu1.name)

sty2=luffystudent('alex','nan',35)
print(sty2.__dict__)   #sty2名称空间，键是属性名，值为属性值