Solution: Program "User" with "Roles"

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class User:
    def __init__(self, roles):
        self.__roles = roles
    def addRole(self, role):
        self.__roles.append(role)
    def listRoles(self):
        for role in self.__roles:
            print(role.getName())

class Role:
    def __init__(self, roleName):
        self.__roleName = roleName
    def getName(self):
        return self.__roleName

class AdminRole(Role):
     pass                         # empty class -> "pass" is necessary

class ViewerRole(Role):
     pass

u1 = User([AdminRole("Administrator"), ViewerRole("Viewer")])
print("User has roles:")
u1.listRoles()