marimo-notebook

Marimo notebooks are reactive Python notebooks stored as pure .py files. Cells auto-execute when dependencies change, modeled as a directed acyclic graph (DAG).

Avoiding Variable Name Conflicts Each global variable must be defined by exactly one cell. Two strategies:

Never use underscore prefixes to generate unique variable names. No exceptions.

ALWAYS use when: creating/editing marimo notebooks, working with any .py file containing @app.cell decorators, building reactive Python notebooks, doing exploratory data analysis in notebook form, converting Jupyter (.ipynb) to marimo, or when user mentions "marimo", "reactive notebook", or asks for an interactive Python notebook. Covers marimo CLI (edit, run, convert, export), UI components (mo.ui.*), layout functions, SQL integration, caching, state management, and wigglystuff widgets. If a task involves notebooks and Python, invoke this skill first. Source: pymc-labs/python-analytics-skills.