python字典排序sorted

1. 按键排序

python

d = {'a': 3, 'b': 1, 'c': 2}

sorted_keys = sorted(d)

结果：['a', 'b', 'c']

python

sorted_items_by_key = sorted(d.items)

结果：[('a', 3), ('b', 1), ('c', 2)]

2. 按值排序

python

sorted_keys_by_value = sorted(d, key=lambda k: d[k])

结果：['b', 'c', 'a']

python

sorted_items_by_value = sorted(d.items, key=lambda item: item[1])

结果：[('b', 1), ('c', 2), ('a', 3)]

3. 转换为有序字典

python

ordered_dict = dict(sorted(d.items, key=lambda x: x[1]))

字典按插入顺序保留排序结果

python

from collections import OrderedDict

ordered_dict = OrderedDict(sorted(d.items, key=lambda x: x[1]))

4. 高级排序

python

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

结果：[('a', 3), ('c', 2), ('b', 1)]

python

d = {'a': 2, 'b': 2, 'c': 1}

sorted_multi = sorted(d.items, key=lambda item: (item[1], item[0]))

结果：[('c', 1), ('a', 2), ('b', 2)]

python

class Person:

def __init__(self, age):

self.age = age

people = {'Alice': Person(25), 'Bob': Person(20)}

sorted_people = sorted(people.items, key=lambda x: x[1].age)

示例代码

python

按值排序并生成有序字典

d = {'a': 3, 'b': 1, 'c': 2}

sorted_by_value = dict(sorted(d.items, key=lambda item: item[1]))

print(sorted_by_value) 输出：{'b': 1, 'c': 2, 'a': 3}

按键降序排序

sorted_by_key_desc = sorted(d.items, reverse=True)

print(sorted_by_key_desc) 输出：[('c', 2), ('b', 1), ('a', 3)]

通过灵活使用`key`和`reverse`参数，可以实现各种复杂的字典排序需求。