python 中各种数据类型的排序问题

list

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

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

 class Student:
        def __init__(self, name, grade, age):
                self.name = name
                self.grade = grade
                self.age = age
        def __repr__(self):
                return repr((self.name, self.grade, self.age))
student_objects = [
        Student('john', 'A', 15),
        Student('jane', 'B', 12),
        Student('dave', 'B', 10),
]
>>> sorted(student_objects, key=lambda student: student.age)   # sort by age
#[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]

dir

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

 多个list同时排序

#变成元组list的形式，然后对list排序再恢复回来
tmlist = []
        for l in range(n):
            tmlist = tmlist + [(X[l][i],y[l],w[l])]
        tmlist =sorted(tmlist,key = lambda x: x[0])
        XX = []
        W = []
        Y = []
        for l in range(n):
            XX = XX+[tmlist[l][0]]
            Y = Y + [tmlist[l][1]]
            W = W + [tmlist[l][2]]