问题：

有一个列表[11, 2, 3, 3, 7, 9, 11, 2],去重并且保持原来的顺序。

 

1 """ 2 有一个列表[11, 2, 3, 3, 7, 9, 11, 2, 3],去重并且保持原来的顺序. 3 """ 4  5 l1 = [11, 2, 3, 3, 7, 9, 11, 2, 3] 6 ret = list(set(l1)) 7 print(ret) 8 ret.sort(key=l1.index)  # 按值在l1中的索引进行排序 9 print(ret)10 11 12 l2 = [13     {"name": "alex", "age": 36},14     {"name": "GoldBoss", "age": 30},15     {"name": "xiaoyima", "age": 18}16 ]17 # 课后作业18 # 以年龄来排序:19 l2.sort(key=lambda x: x["age"])20 print(l2)