MarsSeed [1] filed a deletion request for python2-astroml-git [2]: Broken, abandoned, unused VCS package.
Missing Python2 dependencies. Meanwhile, upstream only supports Py3 now. There's a stable package for Python3 on AUR. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/python2-astroml-git/