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astral-sh / uv

An extremely fast Python package and project manager, written in Rust.
https://docs.astral.sh/uv
Apache License 2.0
17.68k stars 511 forks source link

missing --symlinks #2831

Open axelande opened 4 months ago

axelande commented 4 months ago

I'm trying to debug some native c++ that is a part of my python project with Visual Studio. To get this working with a "pip generated" venv (after ~python 3.10) you need to add --symlinks when you create the the venv on a Windows machine. Do you think that it would be possible to add this option to uv as well? (So that the files gets created as symlinks instead as of copies..)

charliermarsh commented 4 months ago

Do you know why this is necessary for your use-case?

axelande commented 4 months ago

I'm using it to be able to debugg a c++ extension that starts from python. (I'm running the debugging in visual studio)

ncoghlan commented 2 months ago

For my current potential uv use case, I pass --symlinks or --copies to python -m venv explicitly to guard against the platform-specific defaults ever implicitly changing on me (the virtual environments I'm creating need to do the right thing when packaged up as tarballs and/or zip archives, so I really need to know exactly how the relationships between virtual environments and their base environments are being managed).

Given https://github.com/astral-sh/uv/issues/1795 though, I think I'll back off from trying to replace python -m venv for now, and stick with just replacing pip install, pip-compile, and pip-sync.

charliermarsh commented 2 months ago

@ncoghlan -- Sorry to hijack, but do you have an opinion on the correctness of https://github.com/astral-sh/uv/issues/1795?

ncoghlan commented 2 months ago

@charliermarsh I replied over there, but I'm pretty sure python -m venv is in the wrong in the way it is handling attempts to create virtual environments from within virtual environments (I had to change my current project to explicitly create layered venvs from the base Python runtime, since attempting to create them directly from the next layer down gave an unusable environment)