python 知识点整理（五）

本文只是对python部分知识点进行学习和整理
本篇主要是针对python的Object Oriented Programming的总结

本文目录

python 知识点整理（五）
- object/class/inheritance
- - objects
  - class
- inheritance
- Polymorphism and dynamic binding
- recursion 迭代

object/class/inheritance

objects

object: An object has a unique identity, state, and behaviours
In Python, everything is an object: number, string, etc
can use id() and type() to get information about an object
ID位置一般不会改变
数据类型会根据input进行决定
A variable in Python is actually a reference to an object.变量是对对象的引用

class

class name
data fields private/public

private data fields are defined with two leading underscores(__). The same as a private

method
methods

A class provides a special method, init(), which is called initializer(给定默认初始值)
Initializer is invoked when an instance of the class is created

inheritance

Object-oriented programming (OOP) allows you to define new classes from existing classes. This is called inheritance

Polymorphism and dynamic binding

Polymorphism means that an object of a subclass can be passed to a parameter of a superclass type
多态性意味着子类的对象可以传递给超类类型的参数
Python decides which method is invoked at runtime. This is known as dynamic binding
Python决定在运行时调用哪个方法。这就是所谓的动态绑定

recursion 迭代

Linear Recursion
If a recursive function is designed so that each invocation of the body makes at most one new recursive call, this is known as linear recursion
Multiple recursion
When a function makes two or more recursive calls, we say that it uses multiple recursion

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python Object Oriented Programming