循环似乎不遵循顺序 [英] Looping seems to not follow sequence

问题描述

我感觉这里缺少明显的东西！

I feel like I'm missing something obvious here!

seq = {'a': ['1'], 'aa': ['2'], 'aaa': ['3'], 'aaaa': ['4'], 'aaaaa': ['5']}
for s in seq:
    print(s)

输出：

a
aa
aaaa
aaaaa
aaa

当然可以应该输出：

a
aa
aaa
aaaa
aaaaa

这里出了什么问题？

推荐答案

词典没有命令。如果需要依赖顺序，则需要一个OrderedDict-Python 2.7的 collections 模块中有一个，或者您可以使用多种食谱之一。

Dictionaries are not ordered. If you need to rely on the ordering, you need an OrderedDict - there's one in the collections module in Python 2.7, or you can use one of the many recipes around.

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