Home Backend Development Python Tutorial Python classes and inheritance operation code examples

Python classes and inheritance operation code examples

Dec 07, 2016 am 10:32 AM

Post the code you wrote directly for reference:

#encoding=utf-8
__author__ = 'Administrator'
# 类的定义
# **kw 在创建类的实例对象的时候动态的给对象添加参数
class Person(object):
    def __init__(self,name,age,**kw):    ##每个类都有个init 方法
        self.name = name
        self.age = age
        for k,v in kw.iteritems():
            setattr(self,k,v)     ## 用setattr 将动态属性赋值给类对象
class Teacher(Person):  #继承Person类
    __score=0     ## 定义类的私有属性  不能被外界访问
    def __init__(self,name,age,score):
        self.__score = score
        super(Teacher,self).__init__(name,age)    ##继承父类的初始化方法
        print "Teacher.__score =",self.__score
    #---方法也分类方法和实例方法
    #定义类方法 @classmethod 声明 可以直接用Teacher.getScoreForClass()来调用
    @classmethod
    def getScoreForClass(cls):
        return cls.__score
    #定义实例方法 直接用Teacher.getScoreForClass()来调用会报错
    # p.getScoreForExample()
    def getScoreForExample(self):
        return self.__score
from types import MethodType
if __name__ =="__main__":
    #te = Person("TOM",35,addr="USA",sex="M")  ## 类的实例对象 te
    '''
    可以直接改变对象实例的值,如:
    te.name = "BOB"
    也可以直接给对象实例添加属性,如:
    te.lover = "SUM"
    这样并没有给类添加属性,当你在此常见一个类实例时是没有刚才添加的属性的
    '''
    print "befor:", Teacher.getScoreForClass()
    p = Teacher("TOM",33,100)
    print "after :", p.getScoreForExample()
    print "after :",Teacher.getScoreForClass()
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