Re-added comma that I should not have removed.

I thought flake8 complained about this line, but it apparently was a different one.
I wondered about this one.
When you revoke the ('Editor') roles, without comma, you revoke the role E, d, i, t, o, r.
Not what you want. :-)
('Editor',) works.  A list would work too.

src/plone/api/tests/test_user.py

@@ -717,7 +717,7 @@ def test_revoke_roles(self):
         self.assertIn('Editor', api.user.get_roles(username='chuck'))
         self.assertIn('Editor', api.user.get_roles(user=user))
 
-        api.user.revoke_roles(username='chuck', roles=('Editor'))
+        api.user.revoke_roles(username='chuck', roles=('Editor',))
         ROLES = ['Authenticated', 'Member']
         self.assertItemsEqual(
             ROLES,