Top Python standard-library modules

This site demonstrates the five most-imported standard-library modules found by crawling the source of the most-downloaded packages on PyPI and counting their import statements.

Each page is a runnable Jupyter notebook that explains the module and shows its most common functions in action. The pages are executed fresh every time the site is built, so the outputs you see are real.

Rank	Module	Share of packages importing it
1	typing	67.7%
2	sys	65.7%
3	os	62.8%
4	collections	62.0%
5	re	60.6%

Use the sidebar (or the arrows at the bottom of each page) to move between modules.