'Create role from required role_name w/ optional org and course_key. You may just provide a role
name if it\'s a global role (not constrained to an org or course). Provide org if constrained to
an org. Provide org and course if constrained to a course. Although, you should use the subclasses
for all of these.'

def __init__(self, role_name, org='', course_key=None):

    super(RoleBase, self).__init__()
    self.org = org
    self.course_key = course_key
    self._role_name = role_name
