500 Line or Less (Rewritten)

• Readme in English
• 中文自述

Status

This project is working in progress.

Project	Origin Language	Origin Article	Rewrite Language	Rewrite Article	Status
blockcode	Javascript	Blockcode: A visual programming toolkit
ci	Python	A Continuous Integration System	Python	rewrite-ci	Done
cluster	Python	Clustering by Consensus
contingent	Python	Contingent: A Fully Dynamic Build System	Python	rewrite-contingent	Done
crawler	Python	A Web Crawler With asyncio Coroutines
dagoba	Javascript	Dagoba: an in-memory graph database	Python		Working
data-store	Python	DBDB: Dog Bed Database	Python	rewrite-dbdb	Done
event-web-framework	LISP	An Event-Driven Web Framework
flow-shop	Python	A Flow Shop Scheduler	Python	rewrite-flowshop	Done
functionaldb	Clojure	An Archaeology-Inspired Database
image-filters	Processing	Making Your Own Image Filters
interpreter	Python	A Python Interpreter Written in Python	Python	rewrite-interpreter	Done
modeller	Python	A 3D Modeller
objmodel	Python	A Simple Object Model	Python	rewrite-objmodel	Done
ocr	Python	Optical Character Recognition (OCR)
pedometer	Ruby	A Pedometer in the Real World
same-origin-policy	Alloy	The Same-Origin Policy
sampler	Python	A Rejection Sampler
spreadsheet	Javascript	Web Spreadsheet
static analysis	Julia	Static Analysis	Python	rewrite-static-analysis	Done
templating engine	Python	A Template Engine	Python	rewrite-template-engine	Done
web-server	Python	A Simple Web Server	Python	rewrite-web-server	Done

Readme in English

Rewritten of original project 500 Lines or Less with improvements in the following aspects:

• Code written in Python2 are rewritten in Python3
• Replace some of the outdated content with newer mechanism. For example, HTTP processing pipeline are introduced instead of CGI
• Written in a step-by-step manner, showing actual code for each step, so we can see how to make progress
• Some of the projects are developed in a test-driven (TDD) manner

Project relatived articles are published at My blog, in Chinese language.

How to Use

To run the program code, you need

• Python3. Any version higher than Python3.6 should work (not verified, however). Current development environment is Python3.8.

Code of each project is in a separated directory, naming after the original project. Whitespace or hyphen(-) are replaced with underline(_) for the sake of references in code. For thosed developed in a step-by-step manner, each step also has its own sub-directory.

To run a projects written in Python: open main.py in project root, find the entry point for the project of interest, uncomment it and run.

中文自述

本项目试图以更加现代化的方式重写 500 Lines or Less 项目，并在以下方面有所改进：

• 将基于 Python2 的项目改写为基于 Python3
• 删除部分过时的内容，用更适合现实的机制代替。例如，CGI 机制换成了 HTTP 处理管线
• 用循序渐进的方式编写代码，展示每个具体步骤，让读者能够更好地理解
• 部分项目采用测试驱动（TDD）的方式开发。

项目相关的介绍文章发布在 作者的博客.

如何使用

要运行程序代码，需要

• Python3。理论上任何高于 Python3.6 的版本均可（但未验证）。目前使用的开发环境是 Python3.8

各个项目分别放在不同的目录下，命名方式遵照原先的名称，为了方便在代码中引用，部分空格或连字符(-)用下划线(_) 替代。对于使用迭代式开发的项目，每个步骤放在单独的目录下。

对于用 Python 实现的项目，请打开项目根目录下的 main.py， 找到特定的项目以及步骤编号，取消注释并运行。