Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Uv is the best thing to happen to the Python ecosystem in a decade

emily.space

Post reply on HN
Print view View original

391–400 of 1001 posts

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#391

Post by oofbey »

dekhn wrote: post #58

I hadn't paid any attention to rust before uv, but since starting to use uv, I've switched a lot of my performance-sensitive code dev to rust (with interfaces to python). These sorts of improvements really do improve my quality of life significantly. My hope is that conda goes away completely. I run an ML cluster and we have multi-gigabyte conda directories and researchers who can't reproduce anything because just to…

Have you found it easy to write rust modules with python interfaces? What tools do you recommend?

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#392

Post by Me001 »

odyssey7 wrote: post #340
hardwaregeek wrote: post #149

I gotta say, I feel pretty vindicated after hearing for years how Python’s tooling was just fine and you should just use virtualenv with pip and how JS must be worse, that when Python devs finally get a taste of npm/cargo/bundler in their ecosystem, they freaking love it. Because yes, npm has its issues but lock files and consistent installs are amazing

Python might have been better at this but the community was struggling with the 2 vs 3 rift for years. Maybe new tooling will change it, but my personal opinion is that python does not scale very well beyond a homework assignment. That is its sweet spot: student-sized projects.

[dead]

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#393

Post by 9dev »

zahlman wrote: post #251
oblio wrote: post #173

Earlier quoted context omitted.

There are basically 0 other programming languages that use the "directory/shell integration activated virtual environment", outside of Python. How does the rest of the world manage to survive without venvs? Config files in the directory. Shocking, really :-)))

> Config files in the directory. The problem is, that would require support from the Python runtime itself (so that `sys.path` can be properly configured at startup) and it would have to be done in a way that doesn't degrade the experience for people who aren't using a proper "project" setup. One of the big selling points of Python is that you can just create a .py file anywhere, willy-nilly, and execute the code wit…

And how is that different from any other interpreted language? Node and PHP handle this just fine, and they don’t need a Rube Goldberg contraption to load dependencies from a relative directory or the systems library path. I really don’t get why Python people act like that’s some kind of wicked witchcraft?

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#394

Post by gcr »

Rogach wrote: post #172
moleperson wrote: post #124

Earlier quoted context omitted.

Why is the ‘-S’ argument to ‘env’ needed? Based on the man page it doesn’t appear to be doing anything useful here, and in practice it doesn’t either.

Without -S, `uv run --script` would be treated as a binary name (including spaces) and you will get an error like "env: ‘uv run --script’: No such file or directory". -S causes the string to be split on spaces and so the arguments are passed correctly.

On these systems, wouldn’t binfmt attempt to exec(“/usr/bin/env -S uv run --script”, “foo.py”) and fail anyway for the same reason?

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#395

Post by 1718627440 »

jampekka wrote: post #51
hollow-moe wrote: post #15

curl|sh and iwr|iex chills my spine, no one should recommend these methods of installation in 2025. I'm against closed computers but I'm also against reckless install. Even without the security concerns these way of installation tends to put files in a whole random places making it hard to manage and cleanup.

Installing an out-of-distro deb/rpm/msi/dmg/etc package is just as unsafe as curl|sh. Or even unsafer, as packages tend to require root/admin.

That is still checked for its signature, the only thing you bypass is the automatic download over HTTP and dependency resolution by default.

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#396

Post by pnt12 »

mk89 wrote: post #239
hardwaregeek wrote: post #149

I gotta say, I feel pretty vindicated after hearing for years how Python’s tooling was just fine and you should just use virtualenv with pip and how JS must be worse, that when Python devs finally get a taste of npm/cargo/bundler in their ecosystem, they freaking love it. Because yes, npm has its issues but lock files and consistent installs are amazing

I have used pip freeze > requirements.txt pip install -r requirements.txt Way before "official" lockfile existed. Your requirements.txt becomes a lockfile, as long as you accept to not use ranges. Having this in a single tool etc why not, but I don't understand this hype, when it was basically already there.

This is way less than what uv and other package managers do:

- dev dependencies (or other groups) - distinguishing between direct and indirect dependencies (useful if you want to cut some fat from a project) - dependencies with optional extra dependencies (if you remove the main, it will delete the orphans when relevant)

It's not unachievable with pip and virtualenvs, but verbose and prone to human error.

Like C: if you're careful enough, it can be memory safe. But teams would rather rely on memory safe languages.

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#397

Post by jscyc »

whimsicalism wrote: post #97
dekhn wrote: post #58

I hadn't paid any attention to rust before uv, but since starting to use uv, I've switched a lot of my performance-sensitive code dev to rust (with interfaces to python). These sorts of improvements really do improve my quality of life significantly. My hope is that conda goes away completely. I run an ML cluster and we have multi-gigabyte conda directories and researchers who can't reproduce anything because just to…

I work professionally in ML and have not had to touch conda in the last 7 years. In an ML cluster, it is hopefully containerized and there is no need for that?

Very common in education/research systems. Even the things which are containerised often have conda in them.

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#399

Post by pnt12 »

LeoPanthera wrote: post #18

For single-file Python scripts, which 99% of mine seem to be, you can simplify your life immensely by just putting this at the top of the script: #!/usr/bin/env -S uv run --script # /// script # requires-python = ">=3.11" # dependencies = [ "modules", "here" ] # /// The script now works like a standalone executable, and uv will magically install and use the specified modules.

I also recommend the flag for a max release date for $current_date - that basically locks all package versions to that date without a verbose lock file!

(sadly, uv cannot detect the release date of some packages. I'm looking at you, yaml!)

Re: Uv is the best thing to happen to the Python ecosystem in a decade

#400

Post by IMTDb »

brailsafe wrote: post #333
hardwaregeek wrote: post #247

Earlier quoted context omitted.

Never underestimate cultural momentum I guess. NBA players shot long 2 pointers for decades before people realized 3 > 2. Doctors refused to wash their hands before doing procedures. There’s so many things that seem obvious in retrospect but took a long time to become accepted

[flagged]

Usually when someone comes with that argument, I ask them to pick any week date in the past year and then I take a random item on my calendar on that day; I give them the time and address of where I need to be as well as the address of my home and I ask them how long it's going to take me and how much it's going to cost. That's usually enough to bring them down a notch from "train work" to "sometimes train work". (But they tend to forget very often, they need to be reminded regularly for some reason). Do you want to play that game with me to get your reality check in order ?

Western Europe in a VERY dense city BTW.

Post reply on HN