Motivation

1. In Python's ecosystem there is no de facto standard package manager, like Cargo for Rust or Go Modules for Go. That's a problem because when you choose a package manager for your Python project you force all the other mantainers to use the same one, with all its strange gimmicks. That's why pspm is designed in a way that if you don't want it, you can just not use it.
2. You don't need a package manager. Python is there since 1991 and just in 2018-2020 those famous package managers like poetry, pdm were created. What you really need is a way of locking your dependencies and for that that are awesome tools like pip-tools and uv. In fact, pspm is just a wrapper for running uv commands but you could as well run those commands mannualy or with pre-commit, CI.

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Since you are here, you might as well watch this video from Anthony, creator of pre-commit, pytest, and others. This page is highly inspired by his video.