一个python小测试引发的思考---python-list尽可能少用一些，程序复杂的话，可能出bug

math=[('xiaoming',6),('xiaohong',3)]
english=[('xiaoming',3),('xiaozhang',3)]
chinese=[('xiaohong',2),('xiaozhang',4)]
score=[math,english,chinese]
total_score=[('xiaoming',9),('xiaohong',5),('xiaozhang',7)]

my_total_score=[]
for i in score:
    for j in i:
        if len(my_total_score)>0:
            now_name,now_score=j
            my_total_score_name=[i[0] for i in my_total_score]
            if now_name not in my_total_score_name:
                my_total_score.append(j)
            else:
                for i in range(len(my_total_score)):
                    name_score=my_total_score[i]
                    this_name,this_score=name_score
                    if now_name==this_name:
                        my_total_score[i]=(this_name,this_score+now_score)
        if len(my_total_score)==0:
            my_total_score.append(j)
print(my_total_score)
print(my_total_score==total_score)