Python object-oriented learning 1 (what is object-oriented, object-oriented scenario)

Source: Internet
Author: User

three basic structures of programming: object-oriented, process-oriented, functional programming1, what is object-oriented programming object-oriented programming is a way of programming, this programming method of landing needs to use "class" and "object" to implement, so, object-oriented programming is actually the use of "class" and "object". 2, what is a class what is an object, and what relationship can be said that the class is a collection of functions, look at the following code
 class class:# classes name     def  function 1 ()     pass     def function 2 ()      Pass
The Obj= class () #创建一个对象, instantiating the process obj. function 1 () #方法 3, when is object-oriented? When we want to write a machine to upload a file and execute the command script, we can use Process orientedmethod, using the function to write this way:
defupload ():#connecting to a server    #Uploading Files    #Close Connection    Passdefcmd ():#connecting to a server    #执行命令    #Close Connection    Passdefupload_cmd ():#connecting to a server    #Uploading Files    #Execute Command    #Close Connection    Pass

You can do that.

defConnect ():#connecting to a server    PassdefClose ():#Disconnect Connection    Passdefupload (): Connect ()#Uploading FilesClose ()Passdefcmd (): Connect ()#Execute CommandClose ()Passdefupload_cmd (): Connect () upload () cmd () Close ()Pass

It feels like a bit cumbersome, and it's always handled, so what if you use object-oriented?

classSSH (object):def __init__(self,host,port,pwd,username): Self.host=host ...defconnection (self): self.connection=and server creation objects ()defClose (self):#Closeself.connection. Closedefupload (self): self.connection ()#uploading files using a connection    defcmd (self): self.connection ()#using the Execute commandobj= SSH ("', Host,port ....) Obj.connection () obj.upload () Obj.close ( )

We take the public function, extract it, can also create properties belonging to the object, other methods can be used, so it is not better?

There is also a usage scenario, which is similar to templating, and the instance code is as follows:

classRole (object):def __init__(Self, name, role, weapon, life_value=100, money=15000): Self.name=name Self.role=role Self.weapon=Weapon Self.life_value=Life_value Self.money= MoneydefShot (self):Print("%s Shooting ..."%self.name) self.__heart=" die"        Print(self.)__heart)    defgot_shot (self,):Print("%s Say:ah...,i got shot ..."%self.name)defBuy_gun (Self, gun_name):Print("%s just bought%s"%(self.name,gun_name)) Self.weapon= Gun_name#You can change the properties of an object through a classR1= Role ('Alex','Police','AK47')#generate a roler2 = Role ('Jack','Terrorist','B22')#generate a role

Conclusion:

object-oriented does not write, also can achieve and satisfy the function, is more troublesome, and object-oriented simple can be achieved, but no matter what form of programming we use, we have to remember the principle clearly:   1. Writing duplicate code is a very bad low-level behavior 2. The code you write needs to be changed frequently, so it needs to be readable and easy to expand. 3. The main difference between process-oriented programming and OOP is that OOP makes programs more extensible and easy to change

The next article summarizes the object-oriented syntax and features:

Python Object-oriented learning 2 (object-oriented syntax and features)

Python object-oriented learning 1 (what is object-oriented, object-oriented scenario)

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.