Maybe it's gone green because the boto project maintainers have closed this issue:
https://github.com/boto/boto/issues/677 - at the end of the thread Daniel Taylor says 'Python 3 support now works for S3, SQS, Kinesis, and CloudTrail'
What is it that makes a project go green on the wos?
These pull requests seem to indicate that someone has completed work on a whole bunch of other modules to make them Python 3 compatible but the pull requests have not yet been integrated.
https://github.com/boto/boto/pull/2354
https://github.com/boto/boto/pull/2355
https://github.com/boto/boto/pull/2356
https://github.com/boto/boto/pull/2357
https://github.com/boto/boto/pull/2358
https://github.com/boto/boto/pull/2359
https://github.com/boto/boto/pull/2361
https://github.com/boto/boto/pull/2362
https://github.com/boto/boto/pull/2363
https://github.com/boto/boto/pull/2364
https://github.com/boto/boto/pull/2365
So maybe its close but not there yet. Strange that the pythonwos is showing it as green.
I'm using the latest version from github for S3 access with Python 3 and it works fine.