python class with or without "inheritance from object "

• Reference
  python class and inheritance of object

• To make the concept as concise as possible, I won't discuss things too much around the historical fact, instead, let me just state the real use of python class in inheritance of object

• To understand we must first know there are python2 and python3 versions and the class style contains new style and classic style.

  • Difference between new style and classic style
    • There is something around Depth-First Search and Breadth-First Search, and the new tends to be inclined of Breadth-First where old tends to be inclined of Depth-First. For more details of the difference between this 2, visite this link.
    • Python2 uses either old or new where Python3 uses only new as its default form.
  • HOW-TO implements old new for p2, p3 respectively.
    • In python2

    # Python2.x中，默认都是经典类，只有显式继承了object才是新式类，即：
    class Person(object):pass               # 新式类写法
    class Person():pass                     # 经典类写法
    class Person:pass                       # 经典类写法
    

    • in python3

    # 在Python 3.x中取消了经典类，默认都是新式类，
    # 并且不必显式的继承object，也就是说：
    class Person(object):pass
    class Person():pass
    class Person:pass
    # 三种写法并无区别，推荐第一种