前景
众所周知python的字典dict是无序的和元组不同，但是一些特定场景，又需要字典中的数据是有序的，分享并记录下如何解决
注意
python3.7之后字典就更改为有序存储了，不需要重新定义，python3.7之前的可以用以下方法重新定义为有序存储
案例
无序演示
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
dict1 = {'a':1,"b":2,"c":3}
print(dict1)
#多次执行，结果如下：
{'a':1,"b":2,"c":3}
{'a':1,"b":2,"c":3}
{"b":2,'a':1,"c":3}
{"c":3,'a':1,"b":2}
{'a':1,"c":3,"b":2}
|
解决
有序演示
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
import collections
dict2 = collections.OrderedDict()
dict2['a'] = 1
dict2['b'] = 2
dict2['c'] = 3
print(dict2)
#多次执行，结果如下：
{'a':1,"b":2,"c":3}
{'a':1,"b":2,"c":3}
{'a':1,"b":2,"c":3}
{'a':1,"b":2,"c":3}
{'a':1,"b":2,"c":3}
|