RFC 95: End support for Python 3.6 on macOS and Windows

web-platform-tests / rfcs

web-platform-tests RFCs

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RFC 95: End support for Python 3.6 on macOS and Windows #95

Closed foolip closed 2 years ago

jgraham commented 2 years ago

I believe Gecko is currently using 3.6 in CI. @mitchhentges or @ahal might know if we have plans to require 3.7+.

foolip commented 2 years ago

@jgraham that's great to know. Not what I was hoping, but nonetheless :)

gsnedders commented 2 years ago

One option is to just move to testing on Python 3.7 on macOS, but keep Python 3.6 on Linux?

mitchhentges commented 2 years ago

I believe Gecko is currently using 3.6 in CI.

FWIW, Gecko uses 3.6 only for Linux CI work - Mac and Windows work uses 3.7+ (unsure if WPT is using Gecko Mac/Win workers or not, though :smile:)

There's two developments here which may affect this ticket:

Future work this year will create Gecko CI tasks that fetch a target version of Python on-demand, rather than the one installed at the system level. Perhaps that can be utilized for WPT tasks.
As Python 3.6 gets EOL'd this December, I'm relatively confident that we'll be updating our system-level Python in our Linux workers. This is a larger task, since Python's "minor" releases have backwards-incompatibilities, and we'd want our existing Linux work to still be "green", so I'm not sure how long it'll take. I don't know if there's a bug for this yet.

jgraham commented 2 years ago

So it sounds like for Gecko bumping the Mac version to 3.7 in wpt CI should be fine; that will match Gecko CI. But we should keep Linux on 3.6 for now, with the hope of requiring 3.7+ by the time 3.6 is EOL (@mitchhentges feel free to CC me on any bugs related to this work, and I can be proactive about ensuring wpt tasks are using a more modern Python :) ).

gsnedders commented 2 years ago

Also the likelihood of breaking Python 3.6 on macOS while Python 3.6 on Linux still works is low, even if we do marginally care.

foolip commented 2 years ago

OK, so it sounds like what we should do is stop supporting 3.6 on macOS and Windows now (for convenience in Azure Pipelines, really) and then stop supporting 3.6 entirely in early 2022.

foolip commented 2 years ago

I have now updated this to reduce the scope to just macOS and Windows. r?

foolip commented 2 years ago

Closing this, I no longer want to upgrade just macOS and Windows.