python 中各种数据类型的排序问题

list

1 #按照list的第二键值排序 disP2P = [[1,2,3],[2,3,4],[4,5,6]]
2 disP2P = sorted(disP2P,key = lambda x:x[2])

1 student_tuples = [
2         ('john', 'A', 15),
3         ('jane', 'B', 12),
4         ('dave', 'B', 10),
5 ]
6 sorted(student_tuples, key=lambda student: student[2])   # sort by age
7 [('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]

 1  class Student:
 2         def __init__(self, name, grade, age):
 3                 self.name = name
 4                 self.grade = grade
 5                 self.age = age
 6         def __repr__(self):
 7                 return repr((self.name, self.grade, self.age))
 8 student_objects = [
 9         Student('john', 'A', 15),
10         Student('jane', 'B', 12),
11         Student('dave', 'B', 10),
12 ]
13 >>> sorted(student_objects, key=lambda student: student.age)   # sort by age
14 #[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]

dir

1 sorted(d.items(),key = lambda x:x[1],reverse = True)