<https://pantsbuild.slack.com/archives/CASMF8SJ1/p...
# generalh
hundreds-father-404
11/11/2020, 10:34 PMm
mammoth-monkey-19263
11/11/2020, 10:36 PMFoursquare definitely has not completed a migration to Python 3.
h
hundreds-father-404
11/11/2020, 10:37 PMIndeed, perhaps I should change that Foursquare link. That’s actually the blog written from me about Pants’s migration to Py3 when I was a Foursquare intern, which was to unblock Foursquare
m
mammoth-monkey-19263
11/11/2020, 10:37 PMI remember, friend.
❤️ 1
h
hundreds-father-404
11/11/2020, 10:39 PMNone of the functionality in this blog existed in Pants v1 btw. These features are all from things I would have died to have when working on Foursquare’s migration
I’ve been talking to Mateo and Mathieu about possibly upgrading to Pants v2 for the Python portion of the codebase
m
mammoth-monkey-19263
11/12/2020, 12:41 AMI actually logged in to this Slack channel because I started half-heartedly looking into upgrading our pants instance from 1.7.0.
h
hundreds-father-404
11/12/2020, 12:54 AMWoah, I had thought y’all were on something more recent. Let us know how we can help y’all upgrade. Things are much nicer and also faster now
hundreds-father-404
11/12/2020, 12:56 AMProbably the biggest feature Foursquare engineers would like is dependency inference. Removes about 90% of BUILD files and about 30% finger grained cache keys. https://blog.pantsbuild.org/dependency-inference/
I remember thinking Pants was stupid when at 4S because of BUILD files 🙈
hundreds-father-404
11/12/2020, 12:59 AMhttps://www.pantsbuild.org/docs/how-to-upgrade-pants-2-0#step-2-setup-jvm-node-and-go-support-if-relevant describes how you can have JVM still use an old version of Pants and have Python use something modern like 2.0
I remember Mateo and Mathieu had some trouble with JVM concurrency issues when upgrading; it may be much more tractable to only upgrade Python for now
m
mammoth-monkey-19263
11/12/2020, 6:19 PMI saw the post about BUILD inference. It seems like a great feature. I felt the same way about BUILD files when we first started using pants, but now I kind of like them. All our build files are auto-generated by a tool, and I think it is helpful to have a way of inspecting which packages have which dependencies. And it’s really nice to be able to see how dependencies change when reviewing a PR.