Determines the Astropy configuration directory name and creates the directory if it doesn’t exist.

This directory is typically $HOME/.astropy/config, but if the XDG_CONFIG_HOME environment variable is set and the $XDG_CONFIG_HOME/astropy directory exists, it will be that directory. If neither exists, the former will be created and symlinked to the latter.

configdir : str

The absolute path to the configuration directory.