>>> from fair import stands

>>> lf = ['joan pera;2.2;cheese\n',
...  'marta perez;2.3;leather\n',
...  'georgina pi;1.8;jewels\n',
...  'joana morales;1.9;sausages\n',
...  'pere girbau;2.1;cakes\n',
...  'maria marti;2.3;dresses\n',
...  'jordi pons;2;jewels\n',
...  'narcis punti;1.9;leather\n']
>>> with open('stands.txt', 'w') as f:
...    f.writelines(lf)

>>> dic = {'cheese': 'food', 'leather': 'handicraft',
...        'sausages': 'food', 'cakes': 'food',
...        'dresses': 'handicraft', 'jewels': 'handicraft'}

>>> stands('stands.txt', 'food.txt', 'craft.txt', dic, 5.1, 6.1)

>>> with open('food.txt', 'r') as f:
...   a = f.read()
>>> with open('craft.txt', 'r') as g:
...   b = g.read()

>>> a, b
('joan pera\njoana morales\n', 'marta perez\ngeorgina pi\njordi pons\n')