可以用到 operator.attrgetter()方法来实现
from operator import attrgetter class User: def __init__(self, user_id): self.user_id = user_id def __repr__(self): return 'User({})'.format(self.user_id) def sort_notcompare(): users = [User(23), User(3), User(99)] print(users) print(sorted(users, key=lambda u: u.user_id)) print(sorted(users, key=attrgetter('user_id'))) # by_name = sorted(users, key=attrgetter('last_name', 'first_name')) # min(users, key=attrgetter('user_id')) if __name__ == "__main__": sort_notcompare()
使用 operator.attrgetter() 比匿名函数要快