Hacker News Reader

Comment by bionade24 | Hacker News Reader

uv still can't build all wheels and afaik they don't intend to do so. Furthermore they leave their users with 0 indication that the build fails because the wheel is unsupported by uv. If I were a beginnner or intermediate, I'd definitely given up after some attempts of fixing the buildsystem/code of the wheel.

I don't get how uv regularly gets recommended without any note about this.

View on HN

(I work on uv.)

Can you say more? uv should always tell you if a wheel build fails, unless the build backend (which uv doesn’t control, unless you use uv’s own backend) decides to silently ignore a wheel build. This would be a bug in any given build backend IMO.

This is an unfortunate complexity in Python packaging: something like `uv build` can dispatch a wheel build for you, but the actual code that gets run as part of that build is often third-party build backend code that uv itself has little to no control over.

It happened almost 6 months ago, trying to build https://github.com/remsky/Kokoro-FastAPI with uv. From what I can still infer from the dependency list & my shell history, the problematic dep had been pyopenjtalk. After building & installing this dep with pip, I was able to continue to use uv.

We get UV to generate a requirements.txt and then use the Python and Pip which is available on the official Microsoft container images we use for Azure container apps once it hits production. I've never had any issues with the build system in development though.

Can you name some example and explain what happens, that the user is left without indication of failures? I am asking, because I have not had such issues yet, but maybe I just don't know I had them?

Reply on news.ycombinator.com