I wanted to publish my Scrapy download handler to PyPi - UV made it incredibly easy. Here's how. At some point, every scraping developer writes the same middleware twice. The first time is in project A. It works well, so when project B comes along you copy it across. Then project C. Then a colleague asks for it. You email them the file. They make changes. Now there are four versions of the same code living in four different repositories, diverging slowly, none of them getting each other's bug fixes. The solution is a package. Publish it once to the Python Package Index (PyPI) and every project that needs it can install it with pip install your-package . Updates go to everyone at once. The code has a home. This guide walks through the full process using uv , a fast, modern Python toolchain that replaces pip , virtualenv , pip-tools , twine , and build with a single tool. We will write a reusable Scrapy download handler, structure it as a proper Python package, test it, and publish it to PyPI.…