How to Write a Domain-Specific Language (in Python with Lark)

The first time I used Logo, it felt like magic. I could type a short sequence of simple commands, and draw beautifully complex shapes on the screen. In this tutorial, I will show you how to parse and interpret a Logo-like language in just 70 lines of code… Read more

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My favorite terrible Python error message

Students in my Python classes occasionally get the following error message: TypeError: object() takes no parameters This error message is technically true, as I’ll explain in a moment. But it’s surprising and confusing for people who are new to Python, be... (more…)

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