Python实现对自定义类对象排序（利用attrgetter）

from operator import attrgetter

class User:

def __init__(self,userId):

self.userId=userId

def __repr__(self):

return 'User({})'.format(self.userId)

users=[User(40),User(20),User(30)]

print(users)

#方法1

print(sorted(users,key=lambda u:u.userId))

#方法2

print(sorted(users,key=attrgetter('userId')))

[User(40), User(20), User(30)]

[User(20), User(30), User(40)]

[User(20), User(30), User(40)]