Python Recipes vs 小白学数据库

An everyday Python reference, from strings and collections to threading and design patterns. Tricky parts of the examples are explained in comments. You know what you need, but the exact syntax escapes you: • How do I sort a dict by value? • How do I serialize an object to JSON and back? • How do I start a thread and wait for it to finish? Each of these has a ready, working example here; just adapt it to your code. • 22 sections, including basic types, arrays and collections, classes, files, serialization, functions and lambdas, exceptions, regular expressions, threading, databases, algorithms, design patterns. • Language changes by version: 8 sections from Python 3.0 to 3.13, with before-and-after code. • Keyword and function reference: over 200 articles. Browse, search, or tap a word in the code to open its article. • SQL included: over 200 queries (JOIN, GROUP BY, subqueries, data types); more than half run on a real practice database. • Run in the app: the output appears directly below the code, no IDE or local Python needed. More than 90% of examples run. Requires an internet connection. • Search covers the code itself, not just titles: type a fragment you remember and find the example. • Edit examples or add your own; your changes and additions are saved in the app. • Everything except running code works offline. No account needed. Examples are curated from professional sources and checked before release: the code works and is easy to follow. FREE VERSION • 12 runs (examples and SQL combined) and 12 edits a day • Full keyword and function reference, no limits • Up to 5 examples of your own The full version unlocks every example and query, removes the limits on edits and on your own examples, and raises the daily run limits to 30 for examples and 80 for SQL. One-time purchase, no subscription. Built by a developer for developers. The CodePro project has been in active development since 2015.

「小白学数据库」面向想入门关系型数据库与 SQL 的学习者，用结构化课程 + 动手练习 + 题库巩固把「表、行、列、查询、关联、聚合」等概念拆开讲透，再串成一条能跟着走完的学习路径。 应用内提供系统课程，从「数据怎么放进表里」讲到条件筛选、多表关联、分组聚合与常见子句，配合要点提示与随堂小测，帮助你在阅读中及时自检理解是否到位。SQL 练习场内置示例库与示例语句，你可以自由改写、运行并查看结果表，用试错把语法和逻辑练成手感；关卡式练习则把典型场景拆成小目标，循序渐进完成从简单查询到更复杂写法的过渡。题库测验支持多种组卷方式，便于在碎片时间里反复巩固关键词与易混点；语法速查把常用写法集中在一页，方便边练边查。 界面与交互为移动端阅读与输入做了优化，学习进度、测验记录与错题本会随你的使用自然沉淀，方便回顾「卡在哪里、后来怎么想清楚」。无论你是学生、转行新人，还是工作中偶尔要写查询的业务同学，都可以用这款应用把数据库语言从陌生名词，变成你能读得懂、写得出、查得对的一项实用能力。