是否可以添加< key，value>在python的字典结尾配对 [英] Is it possible to add <key, value> pair at the end of the dictionary in python

问题描述

当我引入新的对，它被插入字典的开头。

When I introduce new pair it is inserted at the beginning of dictionary. Is it possible to append it at the end?

推荐答案

词典没有顺序，因此没有开始或结束。显示顺序是任意的。
如果您需要订单，您可以使用 c c c c 而不是 dict ：

Dictionaries have no order, and thus have no beginning or end. The display order is arbitrary. If you need order, you can use a list of tuples instead of a dict:

In [1]: mylist = []

In [2]: mylist.append(('key', 'value'))

In [3]: mylist.insert(0, ('foo', 'bar'))

您将能够轻松地将其转换为 dict 以后：

You'll be able to easily convert it into a dict later:

In [4]: dict(mylist)
Out[4]: {'foo': 'bar', 'key': 'value'}

或者，使用 collections.OrderedDict 。

Alternatively, use a collections.OrderedDict as suggested by IamAlexAlright.

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