# 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`](01_typing.ipynb) | 67.7% |
| 2 | [`sys`](02_sys.ipynb) | 65.7% |
| 3 | [`os`](03_os.ipynb) | 62.8% |
| 4 | [`collections`](04_collections.ipynb) | 62.0% |
| 5 | [`re`](05_re.ipynb) | 60.6% |

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