You have to request the single user endpoint. The "list users" only returns limited data. But you can iterate over the single user endpoint by using the user ids returned from the user list api call:

Get a single user:

# by ID
user = gl.users.get(user_id)
# by username
user = gl.users.list(username='root')[0]

• https://docs.gitlab.com/ee/api/users.html#get-a-single-user
• https://python-gitlab.readthedocs.io/en/stable/gl_objects/users.html#examples