Attrs 19.3.0 was released on 2019-10-15: https://github.com/python-attrs/attrs/releases/tag/19.3.0 The most recent version in Portage is 19.1.0 and should be updated. Reproducible: Always
Already in Gentoo since https://cgit.gentoo.org/repo/gentoo.git/commit/?id=acd8acd5b409a505ca13a39169dbce7ad1ae3f80 , closing.