cfbolz

hugovk, 5 days ago to python

📣🐍📚 Calling all Python library maintainers!

Python 3.13 is now in beta, with the second of four beta releases out later today!

It's now time to start testing your libraries with 3.13 and report any problems back to CPython so they can be fixed before the big October release. And make any updates you need to upgrade your library; keep an eye out for removals and deprecations.

Here's how to test 3.13 on GitHub Actions:

https://dev.to/hugovk/help-test-python-313-14j1

#Python #Python313 #beta #GitHubActions

cfbolz, 6 days ago to random

I just merged the PyPy "known bits" JIT optimization that Nico Rittinghaus and I worked on in the last two years. It allows the JIT to reason about specific bits of integer variables that are known to be 0 or 1. This makes bit-manipulation code faster, sometimes significantly so.

A concrete example of something the JIT now knows, but didn't before: if you add two even integers together, you get an even result.

cfbolz, 6 days ago to random

I just learned that there are floating point numbers that have non-unique (positive) square roots:

>>>> s = {4.472135954999575e-155, 4.472135954999576e-155, 4.472135954999577e-155, 4.472135954999578e-155, 4.472135954999579e-155, 4.4721359549995795e-155, 4.47213595499958e-155}
>>>> len(s)
7
>>>> {x * x for x in s}
{2e-309}

(I suppose it's obvious in hindsight, but I still didn't expect it somehow)

cfbolz, 12 days ago to random

I suppose it's better than the usual news

adamchainz, 19 days ago to python

🐍♦️ Use Git to pass pytest a list of all modified test files:

pytest $(git diff --name-only '/test_.py')

Adjust the pathspec (Git’s “glob” syntax) if you have a different test file naming convention.

#Python #Git

pervognsen, 29 days ago (edited 29 days ago) to random

This is my 30 years belated realization that PHIGS was a 'graphics' pun pretending to be an acronym. I'm not sure if that makes me hate it more or less. I'm leaning towards more. The focus on PHIGS was less welcome when I read Foley and Van Dam than the chapter on dot-matrix printing which at least had some timeless "how stuff worked" appeal. Teaching specific APIs in a textbook almost never ages well.