At stage3, when it try to Downloading 'http://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xz', it will redirect to HTTPS, then got this: https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xz: HTTPS support not compiled in. !!! Couldn't download 'Python-3.5.2.tar.xz'. Aborting. I checked this: ${EPREFIX}/tmp/usr/bin/wget --help found it indeed not compiled with HTTPS support, even at stage3 start I saw use flage has 'ssl' in it. workaround: brew install wget ln -s /usr/local/bin/wget ${EPREFIX}/tmp/usr/bin/wget even though, there is still something need to solve. After that, emerge will try to download a python patch from 'https://dev.gentoo.org', will got its certificate incorrect, need to do this: echo 'check_certificate = off' >> ${EPREFIX}/etc/wgetrc to help it got through.
Python-3.5.2 is on the mirror list now