search
HomeBackend DevelopmentPython TutorialPython list sorting method
Python list sorting methodNov 23, 2016 pm 01:27 PM
python

There are three list sorting methods in the Python language: reverse/reverse sorting, sort forward sorting, and sorted to obtain the sorted list. In more advanced list sorting, the latter two methods can also add conditional parameters for sorting. The
reverse() method

reverses the order of the elements in the list, such as the following
>>> x = [1,5,2,3,4]
>>> x.reverse()
>>> The parameters are sorted and sorted. If you need to sort the parameters in the list, you need to use sort, another sorting method for the list, to sort in positive order.
sort() sorting method

This function method performs a forward sorting of the list contents. The sorted new list will overwrite the original list (the id remains unchanged), that is, the sort sorting method directly modifies the original list list sorting method.
>>> a = [5,7,6,3,4,1,2]
>>> a.sort()
>>> a
[1, 2, 3, 4, 5, 6, 7]

Many python beginners are confused about the sort() method. Sometimes they need a sorted list but want to save the original unsorted list. They will do this:
>>> a = [5,7,6,3,4,1,2]
>>> b = a.sort()
>>> print b
None

The problem arises at this time, the variable b gets a null value. So what should I do if I want to get the sorted list but also want to keep the original list? The list sorted() method can help you achieve this.
sorted() method

can keep the original list and get the sorted list. The sorted() operation method is as follows:
>>> a = [5,7,6,3,4,1, 2]
>>> b = sorted(a)
>>> a
[5, 7, 6, 3, 4, 1, 2]
>>> b
[1 , 2, 3, 4, 5, 6, 7] The

sorted() method can be used in a sequence of any data type, and what is always returned is a list:
>>> sorted('iplaypython.com ')
['.', 'a', 'c', 'h', 'i', 'l', 'm', 'n', 'o', 'o', 'p', 'p ', 't', 'y', 'y']
The difference between the three

sort() is a method of variable objects (dictionaries, lists), with no parameters and no return value. sort() will change the variable Object, so no return value is required. The sort() method is a method or attribute unique to mutable objects. Immutable objects such as tuples and strings do not have these methods. If called, an exception will be returned.
>>> a=[5,4,3,2,1]
>>> a.sort()
>>>
>>> a
[1 , 2, 3, 4, 5]


sorted() is a built-in function of Python. It is not a unique method of mutable objects (lists, dictionaries). The sorted() function requires a parameter (the parameter can be a list, dictionary, Tuple, string), no matter what parameters are passed, a return value with a list as the container will be returned. If it is a dictionary, a list of keys will be returned.
>>> mystring="54321"
>>> mytuple=(5,4,3,2,1)
>>> mylist=[5,4,3,2, 1]
>>> sorted(mystring)
['1', '2', '3', '4', '5']
>>> sorted(mytuple)
[1, 2, 3, 4, 5]
>>> sorted(mylist)
[1, 2, 3, 4, 5]


reverse() is used in the same way as sort, and reversed() is used like sorted () is used in the same way
>>> mylist=[5,4,3,2,1]
>>> mylist.reverse()
>>> mylist
[1, 2, 3, 4, 5]
>>> mylist=[5,4,3,2,1]
>>> for i in reversed(mylist):
... print i,
...
1 2 3 4 5


The "reversal" effect can also be achieved by slicing the sequence
>>> mystring="54321"
>>> mytuple=(5,4 ,3,2,1)
>>> mylist=[5,4,3,2,1]
>>> mystring[::-1]
'12345'
>> > mytuple[::-1]
(1, 2, 3, 4, 5)
>>> mylist[::-1]
[1, 2, 3, 4, 5]

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
详细讲解Python之Seaborn(数据可视化)详细讲解Python之Seaborn(数据可视化)Apr 21, 2022 pm 06:08 PM

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于Seaborn的相关问题,包括了数据可视化处理的散点图、折线图、条形图等等内容,下面一起来看一下,希望对大家有帮助。

详细了解Python进程池与进程锁详细了解Python进程池与进程锁May 10, 2022 pm 06:11 PM

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于进程池与进程锁的相关问题,包括进程池的创建模块,进程池函数等等内容,下面一起来看一下,希望对大家有帮助。

Python自动化实践之筛选简历Python自动化实践之筛选简历Jun 07, 2022 pm 06:59 PM

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于简历筛选的相关问题,包括了定义 ReadDoc 类用以读取 word 文件以及定义 search_word 函数用以筛选的相关内容,下面一起来看一下,希望对大家有帮助。

归纳总结Python标准库归纳总结Python标准库May 03, 2022 am 09:00 AM

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于标准库总结的相关问题,下面一起来看一下,希望对大家有帮助。

分享10款高效的VSCode插件,总有一款能够惊艳到你!!分享10款高效的VSCode插件,总有一款能够惊艳到你!!Mar 09, 2021 am 10:15 AM

VS Code的确是一款非常热门、有强大用户基础的一款开发工具。本文给大家介绍一下10款高效、好用的插件,能够让原本单薄的VS Code如虎添翼,开发效率顿时提升到一个新的阶段。

python中文是什么意思python中文是什么意思Jun 24, 2019 pm 02:22 PM

pythn的中文意思是巨蟒、蟒蛇。1989年圣诞节期间,Guido van Rossum在家闲的没事干,为了跟朋友庆祝圣诞节,决定发明一种全新的脚本语言。他很喜欢一个肥皂剧叫Monty Python,所以便把这门语言叫做python。

Python数据类型详解之字符串、数字Python数据类型详解之字符串、数字Apr 27, 2022 pm 07:27 PM

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于数据类型之字符串、数字的相关问题,下面一起来看一下,希望对大家有帮助。

详细介绍python的numpy模块详细介绍python的numpy模块May 19, 2022 am 11:43 AM

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于numpy模块的相关问题,Numpy是Numerical Python extensions的缩写,字面意思是Python数值计算扩展,下面一起来看一下,希望对大家有帮助。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function