Per https://docs.python.org/3/library/optparse.html
> Deprecated since version 3.2: The optparse module is deprecated and
> will not be developed further; development will continue with the
> argparse module.
For library end users, there is no need to install tests alongside the
package itself. This keeps the tests available for development without
adding extra packages to user's site-packages directory. Reduces the
size of the installed package. Avoids accidental execution of test code
by an installed package.
