>>> from inventari import poques_unitats

>>> poques_unitats('inventari.txt',100)
True
>>> poques_unitats('inventari.txt',5)
False

>>> s = '004512 95 4.80\n009873 12 220.50\n187632 310 3.99\n76543 58 2.10\n9021 440 1.85\n33456 27 67.25\n776521 150 9.30\n55210 6 15.00\n120034 82 18.45\n'
>>> with open ('inventari2.txt','w') as f:
...   n = f.write(s)

>>> poques_unitats('inventari2.txt',439)
True
>>> poques_unitats('inventari2.txt',3)
False