>>> from forum import no_opina
>>> lusuaris = ['santpere;127;57;8', 'hackerx;32;2;0', 'rose;345;764;87',
...   'anneta;543;983;12', 'rllul;2;2;0', 'apolitic;322;345;32', 
...   'nini;2372;7533;674', 'fonaments;372;1372;0']
>>> with open('dades_forum.txt', 'w') as f:
...    for e in lusuaris:
...        a = f.write (e+'\n')
>>> no_opina ('dades_forum.txt')
['hackerx', 'rllul', 'fonaments']