This blog is adapted from our talk at PyCon 2025. marimo is free and open source, available on GitHub. For a free online experience with link sharing, try molab. marimo is a new kind of open-source Python notebook. While traditional notebooks are just REPLs, marimo notebooks are Python programs represented as dataflow graphs. This intermediate representation lets marimo blend the best parts of interactive computing with the reproducibility and reusability of Python software: every marimo noteboo...