This page lists the historical members of the Python development team. (The master list is kept in a private repository due to containing sensitive contact information.)
To be granted the ability to manage who is a committer, you must be a team maintainer of the Python core team on GitHub. Once you have that privilege you can add people to the team. They will be asked to accept the membership which they can do by visiting https://github.com/python and clicking on the appropriate button that will be displayed to them in the upper part of the page.