df = pd.read_csv("data.csv")

scoruri = df.groupby("Operatie").Scor

for x, y in itertools.combinations(scoruri, 2):
    print "'" + x[0] + "'" + " VS " + "'" + y[0] + "'"
    statistic, pvalue = sp.stats.mannwhitneyu(x[1], y[1])
    print "P Value = " + str(pvalue)
    print "\n"