>>> from gestio import notes_alumnes
>>> from estudiantat import Alumne, AlumneExpedient, Assignatura
>>> al1 = Alumne('Tom Brodly', '2C')
>>> al2 = AlumneExpedient('Maria Libra Horner', '2C')
>>> al2.expedient[Assignatura('240111', 4.5)] = 8
>>> al2.expedient[Assignatura('240222', 4.5)] = 7
>>> al2.expedient[Assignatura('240333', 4.5)] = 6
>>> al3 = AlumneExpedient('Tomasa Azcarate Pérez', '2C')
>>> al3.expedient[Assignatura('240111', 4.5)] = 0
>>> al3.expedient[Assignatura('240222', 4.5)] = 1
>>> al3.expedient[Assignatura('240333', 4.5)] = 2
>>> al4 = AlumneExpedient('Enric Torres Masdeu', '2D')
>>> al4.expedient[Assignatura('240111', 4.5)] = 10
>>> al4.expedient[Assignatura('240222', 4.5)] = 10
>>> al4.expedient[Assignatura('240333', 4.5)] = 10
>>> al5 = Alumne('Enriqueta LLorens Batlle', '2X')
>>> al6 = Alumne('Eva Ginemo Trillatlon', '2X')
>>> notes_alumnes([al1, al2, al3, al4, al5, al6])
[('Maria Libra Horner', 7.0), ('Tomasa Azcarate Pérez', 1.0), ('Enric Torres Masdeu', 10.0)]