如何订购字典python（排序） [英] how to order dictionary python (sorting)

问题描述

我使用Python字典：

I use Python dictionary:

>>> a = {}
>>> a["w"] = {}
>>> a["a"] = {}
>>> a["s"] = {}
>>> a
{'a': {}, 's': {}, 'w': {}}

我需要：

>>> a
{'w': {}, 'a': {}, 's': {}}

如何获取填写字典的顺序？

How can I get the order in which I filled the dictionary?

推荐答案

http://docs.python.org/2/library/collections.html#collections.OrderedDict

一个OrderedDict是一个记录键首先被
插入的顺序的dict。如果新条目覆盖现有条目，则原始
插入位置保持不变。删除一个条目并重新插入
将会将其移动到最后。

An OrderedDict is a dict that remembers the order that keys were first inserted. If a new entry overwrites an existing entry, the original insertion position is left unchanged. Deleting an entry and reinserting it will move it to the end.

>>> import collections
>>> a = collections.OrderedDict()
>>> a['w'] = {}
>>> a['a'] = {}
>>> a['s'] = {}
>>> a
OrderedDict([('w', {}), ('a', {}), ('s', {})])
>>> dict(a)
{'a': {}, 's': {}, 'w': {}}

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