The difficulty with python tooling is that you have to learn which tools you can and should completely ignore.
Unless you are a 100x engineer managing 500 projects with conflicting versions, build systems, docker, websites, and AAAH…
- you don’t really need venvs
- you should not use more than on package manager (I recommend pip) and you should cling to it with all your might and never switch. Mixing e.g. conda, on linux system installers like apt, is the problem. Just using one is fine.
- You don’t “need” need any other tools. They are bonuses that you should use and learn how to use, exactly when you need them and not before. (type hinting checker, linting, testing, etc…)
Why is it like this?
Isolation for reliability, because it costs the businesses real $$$ when stuff goes down.
venvs exists to prevent the case that “project 1” and “project 2” use the same library “foobar”. Except, “project 1” is old, the maintainer is held up and can’t update as fast and “project 2” is a cutting edge start up that always uses the newest tech.
When python imports a library it would use “the libary” that is installed. If project 2 uses foobar version 15.9 which changed functionality, and project 1 uses foobar uses version 1.0, you get a bug, always, in either project 1 or project 2. Venvs solve this by providing project specific sets of libraries and interpreters.
In practice for many if not most users, this is meaningless, because if you’re making e.g. a plot with matplotlib, that won’t change. But people have “best practices” so they just do stuff even if they don’t need it.
It is a tradeoff between being fine with breakage and fixing it when it occurs and not being fine with breakage. The two approaches won’t mix.
very specific (often outdated) version of python,
They are giving you the version that they know worked. Often you can just remove the specific version pinning and it will work fine, because again, it doesn’t actually change that much. But still, the project that’s online was the working state.
Coming from the olden days, with good package management, infrequent updates and the idea that you wanted to indeed save that x number of bytes on the disk and in memory, only installing one was the way to go.
Python also wasn’t exactly a high brow academic effort to brain storm the next big thing, it was built to be a simple tool and that included just fetching some library from your system was good enough. It only ended up being popular because it is very easy to get your feet wet and do something quick.