访问项目在ordereddict中 [英] Accessing Items In a ordereddict

问题描述

假设我有以下代码：

import collections
d = collections.OrderedDict()
d['foo'] = 'python'
d['bar'] = 'spam'

是否有一种方式可以以编号的方式访问项目，如：

Is there a way I can access the items in a numbered manner, like:

d(0) #foo's Output
d(1) #bar's Output

推荐答案

< code> OrderedDict（）您可以通过索引来容易地访问元素，通过获得（key，value）对的元组如下

If its an OrderedDict() you can easily access the elements by indexing by getting the tuples of (key,value) pairs as follows

>>> import collections
>>> d = collections.OrderedDict()
>>> d['foo'] = 'python'
>>> d['bar'] = 'spam'
>>> d.items()
[('foo', 'python'), ('bar', 'spam')]
>>> d.items()[0]
('foo', 'python')
>>> d.items()[1]
('bar', 'spam')

注意Python 3.X

dict.items 会返回可迭代的字幕视图对象，而不是列表。我们需要将调用包装到一个列表中，以便使索引可能

dict.items would return an iterable dict view object rather than a list. We need to wrap the call onto a list in order to make the indexing possible

>>> items = list(d.items())
>>> items
[('foo', 'python'), ('bar', 'spam')]
>>> items[0]
('foo', 'python')
>>> items[1]
('bar', 'spam')

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