python中的demo_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。

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2011-02-25 21:36

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