python - 使用 itemgetter 对字典列表进行排序

Question

这是我的词典:

a = [{"id":1,"data":{"age":16,"name":a}}, 
     {"id":3,"data":{"age":35,"name":b}}, 
     {"id":2,"data":{"age":9,"name":c}}]

我想按“年龄”字段排序。

对于 lambda 我使用:

sorted(a, key=lambda k: k['data']['age'])

如何使用 itemgetter 做到这一点？

Answer 1

你最好先给"a"、"b"和"c"加上引号，否则你会混淆dict a和char "a"

a = [{"id":1,"data":{"age":16,"name":"a"}}, 
     {"id":3,"data":{"age":35,"name":"b"}}, 
     {"id":2,"data":{"age":9,"name":"c"}}]

对于 itemgetter :

from operator import itemgetter

a = [{"id":1,"data":{"age":16,"name":"a"}}, 
     {"id":3,"data":{"age":35,"name":"b"}}, 
     {"id":2,"data":{"age":9,"name":"c"}}]

l=sorted(a, key = lambda k : itemgetter('age')(itemgetter('data')(k)) )

print (l)