Perspective User Management - Modes - Access

Hear all
I am setting up user management. I am trying to set different view access in role function.
Edit only if the user does not have a role - “Gestor de usuarios” And I have it Manage users mode.


Also what to hide the admin tole for example and Oscar user. Where should i make the sentence?

if user.get('username') == "Oscar":
	return 0
else:
	return 1

if role == "Administrador":
	return 0
else:
	return 1