python3学习笔记--002--写一个类

代码：

[laolang@localhost classtest]$ cat test.py 
#!/usr/bin/env python
class person:
    def __init__(self,name,age,sex):
        self.name = name
        self.age = age
        self.sex = sex

    def sayHello(self,msg='Hello'):
        print(msg)

    def printInfo(self):
        print('name:' + self.name + ' age:' + str(self.age) + ' sex:' + self.sex )

class student(person):
    def __init__(self,name,age,sex,id,score):
        person.__init__(self,name,age,sex)
        self.id = id
        self.score = score

    def sayHi(self,msg='Hi'):
        print(msg)

    def printInfo(self):
        person.printInfo(self)
        print('id:' + str(self.id) + ' score:' + str(self.score))

per = person('person',24,'man')
per.sayHello()
per.printInfo()

stu = student('xiaodaima',24,'man',1001,100)
stu.sayHi()
stu.sayHello()
stu.printInfo()
[laolang@localhost classtest]$

运行效果：

[laolang@localhost classtest]$ ./test.py 
Hello
name:person age:24 sex:man
Hi
Hello
name:xiaodaima age:24 sex:man
id:1001 score:100
[laolang@localhost classtest]$

定义一个类：

class className:
    def __init__(self,arg1,arg2,...):
        pass
    
    def method1(self,arg1,aarg2,...):
        pass

    def method2(self,arg1,aarg2,...):
        pass

className为类名

__init__(self,arg1,arg2,...)是类的构造方法，当我们使用per = person('person',24,'man')的时候，就会调用person类中的__init__方法

在类中，如果要调用自身的属性，则应当使用self.propertyName

继承一个类：

class className(superClassName):
    def __init__(self,arg1,arg2,arg3,...):
        superClassName.__init__(self,arg1,arg2)
        self.arg3 = arg3

    def method1(self)
        superClassName.method1(self)
        ...

在类名后的括号中写上父类的名字

调用父类的方法：superClassName.method(self,arg1,arg2,..)