Hi,
Python has no mandatory Linux CI job on pull requests anymore. Right now Windows (x64) remains the only mandatory job. Please be careful to manually check other CI before merging a PR.
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We had to deal with at least 3 different issues on the Travis CI over the last 6 months. The latest one (3rd issue) is on the Travis CI side and is known for months. Sometimes, a Travis CI build completes but the GitHub pull request is never updated. Since Travis CI was mandatory, it was never possible to merge some pull requests. I also noticed a 4th bug, sometimes a PR gets *two* Travis CI jobs on a PR for the same Travis CI build, only one is updated, and so again, the PR cannot be merged.
For all these reasons, Travis CI was made optional.
I would be nice to have a mandatory Linux job: "Tests / Ubuntu (pull_request)" is a good candidate. But I didn't check if it's reliable or not.
See https://github.com/python/core-workflow/issues/377 for the discussion.
Note: if someone manages to fix all Travis CI issues, we can reconsider making it mandatory again. But it seems like most people who tried (included me) are tired or bored by Travis CI.
Victor
Night gathers, and now my watch begins. It shall not end until my death.