python之itemgetter函数：对字典列表进行多键排序

Posted 2020-10-01

itemgetter函数：对字典列表进行多键排序

 1 from operator import itemgetter
 2 
 3 list_people = [
 4     {‘name‘: ‘Mike‘, ‘age‘: 22, ‘score‘: 90},
 5     {‘name‘: ‘Alice‘, ‘age‘: 22, ‘score‘: 90},
 6     {‘name‘: ‘Lee‘, ‘age‘: 26, ‘score‘: 92},
 7     {‘name‘: ‘Ben‘, ‘age‘: 26, ‘score‘: 85},
 8     {‘name‘: ‘Tom‘, ‘age‘: 33, ‘score‘: 90},
 9     {‘name‘: ‘Jill‘, ‘age‘: 41, ‘score‘: 72}
10 ]
11 
12 print(‘根据名字排序：‘)
13 for i in sorted(list_people, key=lambda person: person[‘name‘]):
14     ‘‘‘sorted()函数默认升序排列‘‘‘
15     print(i)
16 
17 print(‘\n根据得分降序排列：‘)
18 for i in sorted(list_people, key=itemgetter(‘score‘), reverse=True):
19     ‘‘‘参数reverse=True表示降序排列‘‘‘
20     print(i)
21 
22 print(‘\n根据名字和年龄多键排序：‘)
23 for i in sorted(list_people, key=itemgetter(‘name‘, ‘age‘)):
24     print(i)

运行结果：

1 根据名字和年龄多键排序：
2 {‘name‘: ‘Alice‘, ‘age‘: 22, ‘score‘: 90}
3 {‘name‘: ‘Ben‘, ‘age‘: 26, ‘score‘: 85}
4 {‘name‘: ‘Jill‘, ‘age‘: 41, ‘score‘: 72}
5 {‘name‘: ‘Lee‘, ‘age‘: 26, ‘score‘: 92}
6 {‘name‘: ‘Mike‘, ‘age‘: 22, ‘score‘: 90}
7 {‘name‘: ‘Tom‘, ‘age‘: 33, ‘score‘: 90}