如何获取 python 字典中的顺序数据？

Question

我想在订单中取回钥匙。但是，它不适用于字典和 Collections.OrderedDict.

from collections import OrderedDict

data = OrderedDict({
  "Name1": "value1",
  "Name2": "value2"
})

for key in data.keys():
  print(key)

此代码显示Name3 Name4 ...。它没有任何顺序。我的数据在键中没有字母顺序，我必须按顺序获取键。

我发现词典没有按顺序设计。那么，键值对可以使用哪些结构呢？或者有什么方法可以按自定义顺序使用字典？ (输入顺序..?)

Answer 1

您需要从这个

更改您的有序字典的结构

data = OrderedDict({
  "Name1": "value1",
  "Name2": "value2",
  ...
})

至此

data = OrderedDict([('Name1', 'value1'), ('Name2', 'Value2')])

Answer 2

tl;dr：使用 Python 3.7 或更高版本。

dicts in Python 3.7 and above are always ordered。这适用于各种迭代：

Dictionaries preserve insertion order. Note that updating a key does not affect the order. Keys added after deletion are inserted at the end.

Changed in version 3.7: Dictionary order is guaranteed to be insertion order.

这个also applies to the popitem() method:

Changed in version 3.7: LIFO order is now guaranteed. In prior versions, popitem() would return an arbitrary key/value pair.

https://docs.python.org/3/library/stdtypes.html#dict.popitem

如何获取 python 字典中的顺序数据？

How can I get data with order in python dictionary?

python

dictionary

ordereddict