Lately, some PRs are failing their CI checks with an error that seems unrelated to the PR, see for example #2455 and #2433 and #2436 (although that one also has genuine failures). It looks as if this was a problem with the wrong Python version (2.7 instead of 3.6) to be installed in the path. The only commonality I see between the three pull requests is that all three were submitted by Google employees, but that seems to be incidental.
Lately, some PRs are failing their CI checks with an error that seems unrelated to the PR, see for example #2455 and #2433 and #2436 (although that one also has genuine failures). It looks as if this was a problem with the wrong Python version (2.7 instead of 3.6) to be installed in the path. The only commonality I see between the three pull requests is that all three were submitted by Google employees, but that seems to be incidental.