So I’m no expert, but I have been a hobbyist C and Rust dev for a while now, and I’ve installed tons of programs from GitHub and whatnot that required manual compilation or other hoops to jump through, but I am constantly befuddled installing python apps. They seem to always need a very specific (often outdated) version of python, require a bunch of venv nonsense, googling gives tons of outdated info that no longer works, and generally seem incredibly not portable. As someone who doesn’t work in python, it seems more obtuse than any other language’s ecosystem. Why is it like this?

  • nucleative@lemmy.worldEnglish
    151·
    4 hours ago

    Python developer here. Venv is good, venv is life. Every single project I create starts with

    python3 -m venv venv

    source venv/bin/activate

    pip3 install {everything I need}

    pip3 freeze > requirements.txt

    Now write code!

    Don’t forget to update your requirements.txt using pip3 freeze again anytime you add a new library with pip.

    If you installed a lot of packages before starting to develop with virtual environments, some libraries will be in your OS python install and won’t be reflected in pip freeze and won’t get into your venv. This is the root of all evil. First of all, don’t do that. Second, you can force libraries to install into your venv despite them also being in your system by installing like so:

    pip3 install --ignore-installed mypackage

    If you don’t change between Linux and windows most libraries will just work between systems, but if you have problems on another system, just recreate the whole venv structure

    rm -rf venv (…make a new venv, activate it) pip3 install -r requirements.txt

    Once you get the hang of this you can make Python behave without a lot of hassle.

    This is a case where a strength can also be a weakness.

      • megaman@discuss.tchncs.de
        1·
        4 minutes ago

        The git repo should ignore the venv folder, so when you clone you then create a new one and activate it with those steps.

        Then when you are installing requirements with pip, the repo you cloned will likely have a requirements.txt file in it, so you ‘pip install -r requirements.txt’