Train cycle is supposed to be "we really go for Python 3" cycle. Contrary to previous "we do not have to care about Python 3" ones. I am working on switching Kolla images into Python 3 by default [1]. It is a job I would not recommend even to my potential enemies. Misc projects fail into random ways (sent a bunch of patches). 1. https://review.opendev.org/#/c/642375 Quite common issue is related to README files. I know that we have XXI century and UTF-8 is encoding for most of people here. But Python tools are not so advanced so far and loves to explode when see characters outside of US-ASCII encoding. Please check your README files. And move them to US-ASCII if needed. I already fixed few projects [2][3][4][5] but would love to see developers fixing their code too. 2. https://review.opendev.org/644531 3. https://review.opendev.org/644533 4. https://review.opendev.org/644535 5. https://review.opendev.org/644536