>>> from queviures_limit import QueviuresLimit
>>> q = QueviuresLimit(100, 50)
>>> q.capital, q.magatzem, q.espai_lliure()
(100, {}, 50)
>>> q.comprar('emmental', 5, 4)
>>> q.capital, q.magatzem, q.espai_lliure()
(80, {'emmental': 5}, 45)
>>> q.comprar('cafè', 20, 3)
>>> q.capital, q.espai_lliure(), q.nombre_productes()
(20, 25, 25)
>>> q.comprar('salmó fumat', 2, 100)  # no hi ha prou capital per comprar-ho
>>> q.comprar('galetes', 30, 0.5)     # no hi ha prou espai lliure
>>> q.capital, q.magatzem == {'emmental':5, 'cafè':20}, q.espai_lliure()
(20, True, 25)
>>> len(q)
2
>>> q['cafè'], q['emmental'], q['galetes'], q['salmó fumat']
(20, 5, 0, 0)
>>> q.vendre('emmental', 8)
>>> q.capital, q.espai_lliure(), q.nombre_productes()
(60, 30, 20)
>>> q['cafè'], q['emmental']
(20, 0)

--fi-enunciat

>>> q.comprar('sardines', 10, 3)
>>> q.comprar('ratafia', 3, 20)
>>> q.comprar('caramels', 25, 1)
>>> q.vendre('sobrassada', 15)
>>> (q.capital, q.espai_lliure())
(30, 20)
>>> for prod in ['cafè', 'emmental', 'caramels', 'sardines', 'ratafia']:
...    print(q[prod], end=',')
20,0,0,10,0,
>>> q.nombre_productes(), len(q)
(30, 2)


>>> q = QueviuresLimit(1000, 250)
>>> q.comprar('ratafia', 20, 15)
>>> q.comprar('llet', 100, 1)
>>> q.comprar('roquefort', 30, 5)
>>> q.comprar('caviar', 10, 200)
>>> q.comprar('sardines', 100, 2)
>>> q.comprar('tonyina', 7, 12)
>>> q.comprar('roquefort', 20, 6)

>>> len(q), q.nombre_productes(), q.capital, q.espai_lliure()
(4, 250, 250, 0)
>>> q.magatzem == {'ratafia': 20, 'llet': 100, 'roquefort': 30, 'sardines': 100}
True
>>> for prod in ['caviar', 'ratafia', 'llet', 'pa', 'roquefort', 'sardines', 'tonyina']:
...     print(q[prod], end=',')
0,20,100,0,30,100,0,
>>> for prod, euros in zip(['caviar', 'roquefort', 'llet', 'pa', 'tonyina'], [100, 25, 3, 1, 22]):
...     q.vendre(prod, euros)
...     print(len(q), q.nombre_productes(), q.capital, q.espai_lliure())
4 250 250 0
3 220 1000 30
2 120 1300 130
2 120 1300 130
2 120 1300 130
>>> q.magatzem == {'ratafia': 20, 'sardines': 100}
True