Python 基础—— operator 模块

import operator

operator.itemgetter

operator.itemgetter(1)

lambda x: x[1]

实现多级排序

>>> students = [('john', 'A', 15), ('jane', 'B', 12), ('dave', 'B', 10),]

>>> sorted(students, key=operator.itemgetter(1, 2))
[('john', 'A', 15), ('dave', 'B', 10), ('jane', 'B', 12)]

与 functools 模块的搭配