Needed to clean code after my first major rewrite. 'Coverage.py' is awesome, showed exactly what isn't getting called. I silently broke something on the path to email alerts for the error logger. Oops... @nedbat.com #python #coding

In which the author dives very deep (far deeper than called for) into using Hypothesis to generate data for #Python tests: nedbatchelder.com/blog/202512/...

A useful class that is hard to test thoroughly, and my failed attempt to use Hypothesis to do it: nedbatchelder.com/blog/202512/...

I learned this 1+ year ago from @nedbat.com and had to use it yesterday with the code shown above. I was so annoyed by my code on the left and SUDDENLY I remembered Ned's trick and voilà, my code became so much nicer...

How much is your company spending to support the Python Software Foundation? For comparison, how much do they spend for tips on expensed meals? The PSF runs PyPI, where pip installs from. You depend on PyPI. Fund the PSF. Tip your server! www.python.org/psf/sponsors...

"If you have someone in your life on the spectrum, or are on it yourself, I guarantee you will find new ways to understand the breadth of what autism means and what it can be." nedbatchelder.com/blog/202511/...

Forget about supporting the PSF, too abstract. Pip installs from PyPI. It would be bad if `pip install` stopped working. Support the org that runs PyPI. Surprise, it's the PSF! Your company depends on #Python. You want it to keep working and keep being good. python.org/psf/sponsors/

Boston Python is a good place to connect with people and even have have non-technical discussions: nedbatchelder.com/blog/202510/...

Nice! My coverage dropped from 94.370% to 94.366%! (I deleted code that had been covered, but was no longer needed) github.com/nedbat/cover... github.com/nedbat/cover...

TLDR; The PSF has made the decision to put our community and our shared diversity, equity, and inclusion values ahead of seeking $1.5M in new revenue. Please read and share. pyfound.blogspot.com/2025/10/NSF-... 🧵

I'm writing letters to defend democracy, how are you spending your day? votefwd.org

If you can go out to a march, you can spend an hour writing letters to encourage voters. votefwd.org

Vote Forward is running letter-writing campaigns to US voters. votefwd.org Does it help? Not sure. Doom-scrolling doesn't!

I learned a few algorithms for generative art, you can too: nedbatchelder.com/blog/202509/...

People should spend less time learning DSA, more time learning testing. nedbatchelder.com/blog/202509/...

Vote Forward is running letter-writing campaigns to US voters. votefwd.org Does it help? Not sure. Doom-scrolling doesn't!

My wife's latest for Psychology Today. That's me in the pic, about 22 years ago.. www.psychologytoday.com/us/blog/all-...

Thanks to an amazing contribution by Alex Gaynor, `coverage combine` is now twice as fast! Not released yet, but give it a try and report back. python3 -m pip install git+https://github.com/nedbat/coveragepy

Love it! And stacking parametrize for combinations is cool, too!

The pytest.mark.parametrize feature is amazing, and more people should use it, especially people new to writing #Python tests. But it looks scary. I wrote an explainer: nedbatchelder.com/blog/202508/...

I fixed a handful of issues with the new `patch = subprocess` feature in coverage․py. Try 7.10.3 and let me know how it goes! coverage.readthedocs.io/en/7.10.3/ch...

Every puzzle contains another puzzle: how was it constructed? The game Flow Free asks you to find the paths to connect same-colored dots on a grid. How are these layouts created?

You are a treasure, and I hope you have someone who treasures you.

"Coverage is one of those tools that's just silently awesome." news.ycombinator.com/item?id=4472...

Did you know you can write your own regexes to exclude code from coverage.py measurement? nedbatchelder.com/blog/202507/...

A few more words about the new `patch` option in coverage․py 7.10: "The latest release of Coverage feels like a Christmas present!" nedbatchelder.com/blog/202507/...

@nedbat.com The latest release of Coverage feels like a Christmas present! The native support for Python subprocesses is so good! Thank you for all of it 🙏🏻

In #Python, why is `reversed(range(...))` different than `range(...)`? nedbatchelder.com/blog/202507/...

What's the best way these days to get nightly builds of #Python versions? I have deadsnakes in the coverage․py nightly action, but some of the builds are over two weeks old and I don't know why. Would pyenv be better? uv? Anyone have an example working well for me to copy^H^H^H^H be inspired by?

For Open Path № 2, I talked to @simonwillison.net, @nedbat.com, and five other maintainers to understand the Open Source burnout crisis from their point of view. The dream? Financial support w/o hoops! Full episode: www.youtube.com/watch?v=VTY-...

Are you in Boston and want to hang with #Python people? Boston Python's project & collaboration night is June 24th. It's an informal gathering to talk together, work together, learn from each other, network, whatever. Tell your friends :) www.meetup.com/bostonpython...

Two geometric facts about 63, but how to connect them? nedbatchelder.com/blog/202506/...

Cog 3.5! --check now has --diff to see what changed shorter checksum format to be less distracting current directory restoration to simplify your code and, shocker! --help works! cog.readthedocs.io

39 years ago today.... nedbatchelder.com/blog/202506/...

Every June I dig this up: hachyderm.io/@nedbat/1105...

a friend of mine shared this ai-generated "emotion wheel" and unfortunately i have been laughing my ass off at it for like 15 minutes now. today i am feeling Fnliinneon

Good news: the site is back, though I still have questions about what happened...

Well, I *used* to have a web site! Digital Ocean "upgraded" my server three days ago, and nedbatchelder.com hasn't worked since. They say they are working on it...

Hmm, in CI, the "tests" action works, but the "coverage" action fails, and nothing has changed. Debugging it, I'm going to learn something. >> I learn something new every day, no matter how hard I try.

Intriguing: css-doodle.com

There's an odd resonance when your project's issue numbers start being years that you've lived through: github.com/nedbat/cover...

As a tool author, it's hard to keep up with all the changes to keep my code up-to-date. Sometimes a polite reminder is all it takes: github.com/nedbat/cover... Also, Claude made the code changes, and did a good job!

How desperate is my current "machete mode" debugging? I put "except: pass" on one line instead of two! nedbatchelder.com/text/machete...

Want more play at #PyConUS? Join us at the juggling open-space at 3:45 Saturday outside the 3rd floor rooms. It's not sky-diving, but it's still great! We'll teach you!

My suggestion related to this morning's #PyConUS diversity panel: A simple way to help with inclusion is to sit at lunch with someone who doesn't seem like you, and introduce yourself. It's easy, it's free, and those small connections grow and welcome people in.

💯 this. I also describe PyCon as "like summer camp". Something that also fits into this analogy is the post-camp blues. Coming down off the excitement of PyCon summer camp can feel mildly depressing the week after. @kojoidrissa.bsky.social has written about this: kojoidrissa.com/conferences/...

Headed to #PyConUS, thinking about how to approach the excitement. nedbatchelder.com/blog/202505/...

You may prefer the analysis from @redmonk.com redmonk.com/sogrady/2024... Looking forward to the next one being published.

The TIOBE index is crude, but it's exciting to see #Python continuing to shine: www.tiobe.com/tiobe-index/ Too bad about the simplistic and misleading summary: "[Python] is interpreted and thus prone to unexpected run-time errors."

Anyone going to #PyConUS and can bring some juggling props? I'll bring some, not sure about clubs.