Hi, As per this commit:
https://github.com/python/cpython/commit/92a6abf72e7a8274f96edbb5297119d4ff055be7it looks like this is an error that should only be a warning, and that looks like problem in the interpreter rather than in Horizon. Downgrading the issue as "important" then, and will skip the tests.
Cheers, Thomas Goirand (zigo)
