Backend Development
Python Tutorial
Briefly explain the usage of namedtuple class in Python programming
Briefly explain the usage of namedtuple class in Python programming
Python’s Collections module provides many useful data container types, one of which is namedtuple.
namedtuple can be used to create data types similar to tuples. In addition to being able to use indexes to access data, it can iterate, and it can also conveniently access data through attribute names.
In python, a traditional tuple is similar to an array. Each element can only be accessed through subscripts. We also need to annotate what data each subscript represents. By using namedtuple, each element has its own name, similar to the struct in C language, so that the meaning of the data can be clear at a glance. Of course, declaring namedtuple is very simple and convenient.
The code example is as follows:
from collections import namedtuple
Friend=namedtuple("Friend",['name','age','email'])
f1=Friend('xiaowang',33,'xiaowang@163.com')
print(f1)
print(f1.age)
print(f1.email)
f2=Friend(name='xiaozhang',email='xiaozhang@sina.com',age=30)
print(f2)
name,age,email=f2
print(name,age,email)
Similar to tuple, its properties are also immutable:
>>> big_yellow.age += 1 Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: can't set attribute
Can be easily converted into OrderedDict:
>>> big_yellow._asdict()
OrderedDict([('name', 'big_yellow'), ('age', 3), ('type', 'dog')])
When the method returns multiple values, it is actually better to return the result of namedtuple, so that the logic of the program will be clearer and easier to maintain:
>>> from collections import namedtuple
>>> def get_name():
... name = namedtuple("name", ["first", "middle", "last"])
... return name("John", "You know nothing", "Snow")
...
>>> name = get_name()
>>> print name.first, name.middle, name.last
John You know nothing Snow
Compared with tuple and dictionary, namedtuple is slightly more comprehensive: intuitive and easy to use. It is recommended that you use namedtuple when appropriate.
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
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 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.
What is the function of C language sum?
Apr 03, 2025 pm 02:21 PM
There is no built-in sum function in C language, so it needs to be written by yourself. Sum can be achieved by traversing the array and accumulating elements: Loop version: Sum is calculated using for loop and array length. Pointer version: Use pointers to point to array elements, and efficient summing is achieved through self-increment pointers. Dynamically allocate array version: Dynamically allocate arrays and manage memory yourself, ensuring that allocated memory is freed to prevent memory leaks.
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.
How to convert xml into pictures
Apr 03, 2025 am 07:39 AM
XML can be converted to images by using an XSLT converter or image library. XSLT Converter: Use an XSLT processor and stylesheet to convert XML to images. Image Library: Use libraries such as PIL or ImageMagick to create images from XML data, such as drawing shapes and text.
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 mobile app that can convert XML into PDF?
Apr 02, 2025 pm 09:45 PM
There is no APP that can convert all XML files into PDFs because the XML structure is flexible and diverse. The core of XML to PDF is to convert the data structure into a page layout, which requires parsing XML and generating PDF. Common methods include parsing XML using Python libraries such as ElementTree and generating PDFs using ReportLab library. For complex XML, it may be necessary to use XSLT transformation structures. When optimizing performance, consider using multithreaded or multiprocesses and select the appropriate library.
What is the process of converting XML into images?
Apr 02, 2025 pm 08:24 PM
To convert XML images, you need to determine the XML data structure first, then select a suitable graphical library (such as Python's matplotlib) and method, select a visualization strategy based on the data structure, consider the data volume and image format, perform batch processing or use efficient libraries, and finally save it as PNG, JPEG, or SVG according to the needs.
