Python Recipes vs Leaflet for Swift&Algorithm

Tap Run and the real output appears right under the code, so you know it works before it goes into your project. No IDE, no setup, no account. 370+ short examples, one task each, with comments on the tricky parts. Over 90% run in the app with one tap. Names follow PEP 8, and the output shows every value. You know what you need, but not the exact syntax: • How do I drop duplicates from a list and keep the order? • How do I add a month to a date? • How do I pull a number out of a string with a regex? Each has a working example here. • 22 sections, including strings, dicts, classes, generators, match statements, exceptions, files, and design patterns. • What changed from Python 3.0 to 3.13, with before-and-after code: dict merging with | and |=, f"{x=}", asyncio.run, except*. • Keyword reference, 200+ entries: tap a word in the code to look it up. • 200+ SQL queries: JOIN, GROUP BY, subqueries, window functions; more than half run on a practice database. • Search looks inside the code: type defaultdict to find every example that uses it. • Edit an example and run your version, or write your own. • Works on iPhone, iPad, and Mac. • Everything except running code works offline. Free version: 320+ examples and queries, the full keyword reference, and 12 runs, 12 edits and up to 12 reference entries a day opened by tapping a word in the code (Python and SQL runs share one count). Full version: all examples and queries, unlimited edits and examples of your own, and up to 30 Python and 80 SQL runs a day. One-time purchase, no subscription. Built by a developer for developers. Maintained since 2015. WHAT'S NEW • Improved support for foldable phones and large screens.

Leaflet helps you learn Swift/SwiftUI and Data Structure/Algorithms better. Leaflet has four main functions: 【1】Algorithm Animation Visualization Through exquisite and intuitive animation demos, abstract algorithms and data structures are made visual — every step of execution is clearly visible. This is the core highlight of Leaflet. - Animation Demos: Carefully selected classic algorithms (sorting, searching, graph algorithms, dynamic programming, recursion, etc.) built with SwiftUI + Combine for smooth animations that make algorithm execution crystal clear. - Interactive Playback: Support play, pause, step forward / step backward, and adjustable playback speed — control your learning pace freely. - Data Structure Visualization: Arrays, linked lists, stacks, queues, trees, graphs and other data structures are presented graphically; insert, delete, and traverse operations are intuitive at a glance. - Synchronized Code View: Animation demos are displayed alongside the corresponding Swift source code, letting you learn code while watching the animation — more efficient learning. - Complexity Analysis: Visually shows the time / space complexity trends of algorithms, helping you build performance-analysis thinking. Learning algorithms is no longer dry code reading, but a vivid visual experience — every algorithm becomes something you can "see and touch". 【2】Swift Tutorial - Swift one-hour micro class, quickly master the core knowledge points of Swift grammar - Swift5 complete tutorial covering all language features from beginner to advanced - Swift Code Style Guide for writing more standardized code - Swift design pattern practice 【3】Swift + SwiftUI + Combine SwiftUI's declarative UI paired with Combine's functional reactive framework — simple to learn, high-performance, and reliable, enabling developers to quickly build elegant applications. 【4】Algorithm Solutions Curated representative algorithm problems implemented in Swift, covering data structures and algorithm analysis to help you master algorithm complexity and performance analysis. Part of the application is based on the open source protocol from the following open source libraries, Gratitude: https://github.com/raywenderlich/swift-algorithm-club , Algorithms and data structures in Swift, with explanations! https://github.com/andyRon/swift-algorithm-club-cn, swift-algorithm-club's translation. Learn algorithms and data structures using Swift.