Binary package “python-astropy” in ubuntu bionic

Core functionality for performing astrophysics (Python 2 legacy)

 The astropy package contains core functionality and some common tools
 needed for performing astronomy and astrophysics research with Python.
 It can be extended by a number of "affiliated packages" that are
 intended to work with the core package.
 .
 This is the Python 2 legacy package. Please use python3-astropy instead.