Python常用列表数据结构小结
本文汇总了Python列表list一些常用的对象方法，可供初学者参考或查询，具体如下：
1.list.append(x)
把元素x添加到列表的结尾，相当于a[len(a):] =[x]，代码如下：
>>> a=[1,2,3,4,5] >>> a [1, 2, 3, 4, 5] >>> a.append(-2) >>> a [1, 2, 3, 4, 5, -2]
2. list.extend(L)
将一个列表中的所有元素都添加到另一个列表中，相当于 a[len(a):] = L，代码如下：
>>> a [1, 2, 3, 4, 5, -2] >>> L=[5,9,7] >>> L [5, 9, 7] >>> a.extend(L) >>> a [1, 2, 3, 4, 5, -2, 5, 9, 7]
3. list.insert(i,x)
将元素x，插到索引号i之前，代码如下：
>>> a [1, 2, 3, 4, 5, -2, 5, 9, 7] >>> a.insert(0,-3) >>> a [-3, 1, 2, 3, 4, 5, -2, 5, 9, 7] >>> a.insert(len(a),10) >>> a [-3, 1, 2, 3, 4, 5, -2, 5, 9, 7, 10]
4. list.remove(x)
删除元素x（第一次出现的），代码如下：
>>> a [-3, 1, 2, 3, 4, 5, -2, 5, 9, 7, 10] >>> a.append(1) >>> a [-3, 1, 2, 3, 4, 5, -2, 5, 9, 7, 10, 1] >>> a.remove(1) >>> a [-3, 2, 3, 4, 5, -2, 5, 9, 7, 10, 1]
5. list.count(x)
计算元素x出现的次数，代码如下：
>>> a [-3, 2, 3, 4, 5, -2, 5, 9, 7, 10, 1] >>> a.count(3) 1
6. list.sort()
对列表元素进行排序，代码如下：
>>> a.sort() >>> a [-3, -2, 1, 2, 3, 4, 5, 5, 7, 9, 10]
7. list.reverse()
倒排列表中元素，代码如下：
>>> a [-3, -2, 1, 2, 3, 4, 5, 5, 7, 9, 10] >>> a.reverse() >>> a [10, 9, 7, 5, 5, 4, 3, 2, 1, -2, -3]
8. list.index(x)
返回表中第一个出现值为x的索引，代码如下：
>>> a [10, 9, 7, 5, 5, 4, 3, 2, 1, -2, -3] >>> a.index(9) 1
9. list.pop(i)
从列表指定位置i删除元素，并将此元素返回，若未指定位置则删除列表最后一位元素，并将此元素返回。代码如下：
>>> a [10, 9, 7, 5, 5, 4, 3, 2, 1, -2, -3] >>> a.pop(0) 10 >>> a [9, 7, 5, 5, 4, 3, 2, 1, -2, -3] >>> a.pop() -3
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to open xml format
Apr 02, 2025 pm 09:00 PM
Use most text editors to open XML files; if you need a more intuitive tree display, you can use an XML editor, such as Oxygen XML Editor or XMLSpy; if you process XML data in a program, you need to use a programming language (such as Python) and XML libraries (such as xml.etree.ElementTree) to parse.
Is there any mobile app that can convert XML into PDF?
Apr 02, 2025 pm 08:54 PM
An application that converts XML directly to PDF cannot be found because they are two fundamentally different formats. XML is used to store data, while PDF is used to display documents. To complete the transformation, you can use programming languages and libraries such as Python and ReportLab to parse XML data and generate PDF documents.
Is the conversion speed fast when converting XML to PDF on mobile phone?
Apr 02, 2025 pm 10:09 PM
The speed of mobile XML to PDF depends on the following factors: the complexity of XML structure. Mobile hardware configuration conversion method (library, algorithm) code quality optimization methods (select efficient libraries, optimize algorithms, cache data, and utilize multi-threading). Overall, there is no absolute answer and it needs to be optimized according to the specific situation.
How to modify comment content in XML
Apr 02, 2025 pm 06:15 PM
For small XML files, you can directly replace the annotation content with a text editor; for large files, it is recommended to use the XML parser to modify it to ensure efficiency and accuracy. Be careful when deleting XML comments, keeping comments usually helps code understanding and maintenance. Advanced tips provide Python sample code to modify comments using XML parser, but the specific implementation needs to be adjusted according to the XML library used. Pay attention to encoding issues when modifying XML files. It is recommended to use UTF-8 encoding and specify the encoding format.
Recommended XML formatting tool
Apr 02, 2025 pm 09:03 PM
XML formatting tools can type code according to rules to improve readability and understanding. When selecting a tool, pay attention to customization capabilities, handling of special circumstances, performance and ease of use. Commonly used tool types include online tools, IDE plug-ins, and command-line tools.
Is there a free XML to PDF tool for mobile phones?
Apr 02, 2025 pm 09:12 PM
There is no simple and direct free XML to PDF tool on mobile. The required data visualization process involves complex data understanding and rendering, and most of the so-called "free" tools on the market have poor experience. It is recommended to use computer-side tools or use cloud services, or develop apps yourself to obtain more reliable conversion effects.
How to convert XML to PDF on your phone with high quality?
Apr 02, 2025 pm 09:48 PM
Convert XML to PDF with high quality on your mobile phone requires: parsing XML in the cloud and generating PDFs using a serverless computing platform. Choose efficient XML parser and PDF generation library. Handle errors correctly. Make full use of cloud computing power to avoid heavy tasks on your phone. Adjust complexity according to requirements, including processing complex XML structures, generating multi-page PDFs, and adding images. Print log information to help debug. Optimize performance, select efficient parsers and PDF libraries, and may use asynchronous programming or preprocessing XML data. Ensure good code quality and maintainability.
How to convert XML files to PDF on your phone?
Apr 02, 2025 pm 10:12 PM
It is impossible to complete XML to PDF conversion directly on your phone with a single application. It is necessary to use cloud services, which can be achieved through two steps: 1. Convert XML to PDF in the cloud, 2. Access or download the converted PDF file on the mobile phone.
