03-python的新式类和经典类区别

__name__ is the attribute‘s name.
__doc__ is the attribute‘s docstring.
__get__(object) is a method that retrieves the attribute value from object.
__set__(object, value) sets the attribute on object to value.
__delete__(object, value) deletes the value attribute of object.

Python 2.x中默认都是经典类，只有显式继承了object才是新式类
python 3.x中默认都是新式类,经典类被移除，不必显式的继承object

#!/usr/bin/env python3
#coding:utf-8
‘‘‘
    新式类和经典类的区别, 多继承代码演示

‘‘‘

class A:
    def __init__(self):
        print ‘this is A‘
    def save(self):
        print ‘save method from A‘

class B:
    def __init__(self):
        print ‘this is B‘

class C:
    def __init__(self):
        print ‘this is c‘
    def save(self):
        print ‘save method from C‘

class D(B, C):
    def __init__(self):
        print ‘this is D‘


d = D()
d.save()