python sort() sorted() argsort()函数

sort表示排序

sorted表示在原基础上创建副本排序

argsort函数返回的是数组值从小到大的索引值

默认是从小到大排序

sorted(iterable, cmp=None, key=None, reverse=True)

 

# -*- coding: utf-8 -*-
from numpy import *
import operator

student_tuples = [('Jerry', 'C', 15), ('Tom', 'B', 12),('Bill', 'B', 10)]
age_asc = sorted(student_tuples, key=operator.itemgetter(2))
print (age_asc)
score_desc = sorted(age_asc, key=operator.itemgetter(1), reverse=True)
print (score_desc)

 

结果如下：

[('Bill', 'B', 10), ('Tom', 'B', 12), ('Jerry', 'C', 15)]
[('Jerry', 'C', 15), ('Bill', 'B', 10), ('Tom', 'B', 12)]

其中key=operator.itemgetter(1)表示从第几个元素排序