The latest articles on DEV Community by ruanqizhen (@ruanqizhen). https://dev.to/ruanqizhen https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4077590%2F78ba21ba-4e0d-4e5d-ab9a-8ac8cad593f1.jpg https://dev.to/ruanqizhen en ruanqizhen Fri, 14 Aug 2026 11:14:22 +0000 https://dev.to/ruanqizhen/the-python-codex-a-free-story-driven-python-tutorial-i-wish-i-had-531e https://dev.to/ruanqizhen/the-python-codex-a-free-story-driven-python-tutorial-i-wish-i-had-531e <p>I learned Python the messy way – years of Googling, Stack Overflow, no real book. So I finally wrote the one I wish I had.</p> <p>It's The Python Codex – free, no paywall, no signup:</p> <p>👉 <a href="https://py.qizhen.xyz/en/" rel="noopener noreferrer">https://py.qizhen.xyz/en/</a></p> <p>I wrapped it in a little story – a journey to the planet Pythora where Python runs reality – but underneath it's a proper tutorial:</p> <p>Part 1: Fundamentals<br> Part 2: Functional Programming<br> Part 3: OOP<br> Part 4: Data Structures &amp; Algorithms with interview questions<br> Part 5: Python in the wild – viz, web, networking<br> I built it as an open book, you can comment or click "Edit this page" on any page.</p> <p>If you're learning Python, give it a try. I'd love to hear what's confusing or what's missing.</p> beginners learning python tutorial