Python Basics = = = new Class and classic class

First of all:

Python 2.x is the classic class by default, and only the explicit inheritance of object is the new class

Python 3.x is a new class by default and does not have to inherit an object explicitly

The difference between the two categories:

The new class redefinition method is more, of course, this is not the point, the point is that the two species in the multi-inheritance state to find the "method" of the rules are different.

Classic class: Depth lookup

Display class: Breadth Lookup

Secondly:

------A new class object can get its own type directly from the __class__ property: type

------The order of inheritance search has changed, the classic class multi-inheritance Property search order: First deep inheritance tree left, then return, start looking for the right; new class multi-inheritance Property search Order: Horizontal Search first, then move up

------New class adds __slots__ built-in properties that lock the type of instance attribute to the __slots__ specified range

The __getattribute__ method is added------new class

Python Basics = = = new Class and classic class