def _mutate_proc(player):
idx = random.randint(0, len(range_list)-1)
r = range_list[idx]
i = iter(r)
s = int(next(i))
e = int(next(i))
u = int(next(i))
cnt = (e-s)/u
v = (random.randint(0, cnt)*u)+s
genelist = player.get_genelist()
genelist[idx] = v
geneid = _genelist2id(genelist)
return geneid
