from itertools import product, compress

def sub_sum(L, goal):
    return [ tuple(compress(L,f)) for f in product([0, 1], repeat=len(L))
             if sum(compress(L,f)) == goal ] 

L = [ 25, 30, 15, 20, 30, 40, 35, 10 ]
R = sub_sum(L, 120)

for item in R: print(item)