search
HomeBackend DevelopmentPython TutorialAdvanced Python Dictionary: Explore advanced usage and unlock new realms
Advanced Python Dictionary: Explore advanced usage and unlock new realmsFeb 23, 2024 pm 01:34 PM
pythondictionarypython programkey value pairNested dictionariesDictionary operationsAdvanced search techniques

Python 字典进阶:探索高级用法,解锁新境界

Nested Dictionary

Nested dictionaries are data structures that use one dictionary as the value of another dictionary. This allows you to create complex data structures, organizing data into hierarchies. For example, you can create a dictionary to store student information, where each student's dictionary contains information such as name, student ID, and grades.

students = {
"Alice": {
"name": "Alice Smith",
"id": 12345,
"grades": [90, 85, 95]
},
"Bob": {
"name": "Bob Jones",
"id": 23456,
"grades": [80, 90, 85]
}
}

To access values ​​in a nested dictionary, you can use the dot operator (.). For example, to get Alice's name, you can use the following code:

name = students["Alice"]["name"]

Dictionary operations

python provides many built-in functions to operate on dictionaries. These functions allow you to add, delete, and update values ​​in the dictionary, as well as find and sort keys and values ​​in the dictionary.

Some commonly used dictionary operation functions include:

  • len(): Returns the number of key-value pairs in the dictionary.
  • keys(): Returns a list of all keys in the dictionary.
  • values(): Returns a list of all values ​​in the dictionary.
  • items(): Returns a list of all key-value pairs in the dictionary.
  • get(): Get the value of the specified key in the dictionary. If the key does not exist, None is returned.
  • setdefault(): If the specified key does not exist in the dictionary, the key is added to the dictionary and its value is set to the given value. If the key exists, the value of the key is returned.
  • update(): Add key-value pairs from another dictionary to the current dictionary.

Advanced Search Tips

Python provides a variety of methods to search for values ​​in a dictionary. In addition to using the get() function, you can also use the in operator to check if a key exists in the dictionary, or use a for loop to iterate over the dictionary All key-value pairs in .

Additionally, you can use the sorted() function to sort keys or values ​​in a dictionary. For example, to sort student names in the students dictionary in ascending order, you would use the following code:

sorted_students = sorted(students.items(), key=lambda x: x[1]["name"])

Conclusion

Dictionaries are powerful data structures in Python that help you store and retrieve data. Understanding advanced uses of dictionaries unlocks the full potential of dictionaries and helps you write more powerful and efficient Python programs.

The above is the detailed content of Advanced Python Dictionary: Explore advanced usage and unlock new realms. For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:编程网. If there is any infringement, please contact admin@php.cn delete
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
3 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

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools