>>> from inventari import valor_total

>>> round(valor_total('inventari.txt'),2)
15897.13

>>> 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)

>>> round(valor_total('inventari2.txt'),2)
10088.35