Python demo之 classdemo

Python和其他面向对象语言一样没有多少区别。过程就是这样：定义类，定义函数，创建对象，调用方法完成功能。继承就是类名后面加上（） 然后加入父类的名称就OK

相对而言，要注意的就是self其实相当于java中的this，定义函数时，无参数的时候要加上这个self。具体看这个demo:class Person:

 

class Person:
    count = 0
    def __init__(self,name):
        self.name =name
        Person.count+=1
    def say(self):
        print("this is ", self.name)
        Person.count-=1
    def showCount(self):
        if(Person.count ==1):
            print("this is just  a start")
        if(Person.count ==0):
            print("this is just  an end")

class Man(Person):
    def __init__(self,name,age):
         Person.__init__(self,name)
         self.age = age
    def say(self):
         Person.say(self)
         print("this is from person", self.name)
    def showCount(self):
        if(Person.count ==2):
            print("this is just  a start from  Man")
        if(Person.count ==0):
            print("this is just  an end from  Man")

p = Person("shuofeng")
p.showCount()
p.say()
p.showCount()

man = Man("lxy",26)
man.showCount()
man.say()
man.showCount()

 

执行结果当然比较简单  就是打印 

 

this is just  a start

this is  shuofeng

this is just  an end

this is  lxy

this is from person lxy

this is just  an end from  Man

 

说明：这里的count就像是static 声明的一个静态变量一样。

 

 

PS:if  else  while等控制流和java区别不大，continue，break照常使用。