生成所有sequence Yahtzee part 1

def gen_all_sequences(outcomes, length):      answer_set = set([()])    for dummy_idx in range(length):        temp_set = set()        for partial_sequence in answer_set:            for item in outcomes:                new_sequence = list(partial_sequence)                new_sequence.append(item)                temp_set.add(tuple(new_sequence))        answer_set = temp_set    return answer_set

outcome为带有elements 的tuple/list， length为生成sequence中tuple的长度 

例子：

    print gen_all_sequences(（1，2，3，4，5）, 2)