如何按键对字典进行排序?
示例输入:
{2:3, 1:89, 4:5, 3:0}
期望的输出:
{1:89, 2:3, 3:0, 4:5}
如何按键对字典进行排序?
示例输入:
{2:3, 1:89, 4:5, 3:0}
期望的输出:
{1:89, 2:3, 3:0, 4:5}
当前回答
2.7中两个方法的时间比较显示它们实际上是相同的:
>>> setup_string = "a = sorted(dict({2:3, 1:89, 4:5, 3:0}).items())"
>>> timeit.timeit(stmt="[(k, val) for k, val in a]", setup=setup_string, number=10000)
0.003599141953657181
>>> setup_string = "from collections import OrderedDict\n"
>>> setup_string += "a = OrderedDict({1:89, 2:3, 3:0, 4:5})\n"
>>> setup_string += "b = a.items()"
>>> timeit.timeit(stmt="[(k, val) for k, val in b]", setup=setup_string, number=10000)
0.003581275490432745
其他回答
或者用熊猫,
演示:
>>> d={'B':1,'A':2,'C':3}
>>> df=pd.DataFrame(d,index=[0]).sort_index(axis=1)
A B C
0 2 1 3
>>> df.to_dict('int')[0]
{'A': 2, 'B': 1, 'C': 3}
>>>
See:
这方面的文档 整只熊猫的记录
dictionary = {1:[2],2:[],5:[4,5],4:[5],3:[1]}
temp=sorted(dictionary)
sorted_dict = dict([(k,dictionary[k]) for i,k in enumerate(temp)])
sorted_dict:
{1: [2], 2: [], 3: [1], 4: [5], 5: [4, 5]}
在这里,我找到了一些最简单的解决方案,使用pprint按键对python字典进行排序。 如。
>>> x = {'a': 10, 'cd': 20, 'b': 30, 'az': 99}
>>> print x
{'a': 10, 'b': 30, 'az': 99, 'cd': 20}
但是当使用pprint时,它将返回排序后的dict
>>> import pprint
>>> pprint.pprint(x)
{'a': 10, 'az': 99, 'b': 30, 'cd': 20}
from operator import itemgetter
# if you would like to play with multiple dictionaries then here you go:
# Three dictionaries that are composed of first name and last name.
user = [
{'fname': 'Mo', 'lname': 'Mahjoub'},
{'fname': 'Abdo', 'lname': 'Al-hebashi'},
{'fname': 'Ali', 'lname': 'Muhammad'}
]
# This loop will sort by the first and the last names.
# notice that in a dictionary order doesn't matter. So it could put the first name first or the last name first.
for k in sorted (user, key=itemgetter ('fname', 'lname')):
print (k)
# This one will sort by the first name only.
for x in sorted (user, key=itemgetter ('fname')):
print (x)
我发现对字典进行排序的一个简单方法是,根据要排序的字典的排序键:值项创建一个新字典。 如果你想对dict ={}排序,使用相关的方法检索它的所有项,使用sorted()函数对它们排序,然后创建新字典。
下面是使用字典理解的代码:
sorted_dict = {k:v for k,v in sorted(dict.items())}