Python笔记之面向对象

1。类和对象

#create a class class fruit: def say(self): print "hello, python" if __name__ == "__main__": f = fruit() #不同于Java，不用new f.say() 2，属性和方法

#create a class class fruit: price = 0<span style="white-space:pre"> </span>#类属性 def __init__(self): self.color = "red" zone = "china" # def getColor(self): print self.color @ staticmethod #covert ordinary method to static method def getPrice(): print fruit.price def say(self): print "hello, python" if __name__ == "__main__": f = fruit() f.say() apple = fruit() apple.getColor()

构造函数。__init__()方法，可选，不提供有默认的

析构函数用语释放对象占用的资源。__del__()

垃圾回收机制，Python採用引用计数方式。

gc.collect() #显式调用垃圾回收器

3。继承

class Fruit: def __init__(self, color): self.color = color print "fruit's color is %s" % self.color def sayname(self): print "Fruit name" class Apple(Fruit): def __init(self, color): Fruit.__init__(self, color) print "Apple's color is %s" % self.color def sayname(self): print "My name is Apple" class Banana(Fruit): def __init__(self, color): Fruit.__init__(self, color) print "Banana's color is %s" % self.color def sayname(self): print "My name is banana" if __name__ == "__main__": apple = Apple("red") apple.sayname() banana = Banana("yelloe") banana.sayname()

＃抽象类模拟

def abstract(): raise NotImplementError(“abstract”) class Fruit: def __init__(self): if self.__class__ is Fruit: abstract() print “Fruit” class Apple(Fruit): def __init(self): Fruit.__init__(self) print "Apple" def sayname(self): print "My name is Apple" ＃多态。多重继承 略

转载于:https://www.cnblogs.com/bhlsheji/p/5203406.html

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