有没有办法保持字典值的顺序？

问题描述

以下是我从元组列表中查找不同站点和不同名称的代码：

from collections import defaultdict,OrderedDict
weblogs = [
     ('Nanda','google.com'),('Maha',('Fei','python.org'),('Nanda','dzone.com'),]
web = [t for t in (set(tuple(i) for i in weblogs))]
res = defaultdict(list)
for i,j in web:
    res[j].append(i)

a = OrderedDict()
a = dict(res)
for i,j in sorted(a.items()):
    print(i,j)

此输出在以下两个输出之间不断变化：

dzone.com ['Fei']
google.com ['Maha','Nanda']
python.org ['Nanda','Fei']

dzone.com ['Fei']
google.com ['Nanda','Maha']
python.org ['Fei','Nanda']

有没有办法保持值的恒定顺序？

解决方法

问题来自集合中值的顺序。一个简单的解决方案是更改该行：

web = [t for t in (set(tuple(i) for i in weblogs))]

像这样：

web = [t for t in (sorted(set(tuple(i) for i in weblogs)))]