将条目添加到列表的开头并删除最后一个 [英] Add entry to beginning of list and remove the last one

问题描述

我的list大约有40个条目.而且我经常想将一个项目附加到列表的开头(标识为0)，并想要删除列表的last条目(标识为40).

I have a list of about 40 entries. And I frequently want to append an item to the start of the list (with id 0) and want to delete the last entry (with id 40) of the list.

我该如何做到最好?

包含5个条目的示例:

[0] = "herp"
[1] = "derp"
[2] = "blah"
[3] = "what"
[4] = "da..."

在添加"wuggah"并最后删除之后，应该像这样:

after adding "wuggah" and deleting last it should be like:

[0] = "wuggah"
[1] = "herp"
[2] = "derp"
[3] = "blah"
[4] = "what"

我不想结束手动将所有条目逐个移动到下一个ID的情况.

And I don't want to end up manually moving them one after another all of the entries to the next id.

推荐答案

使用收藏.deque :

>>> import collections
>>> q = collections.deque(["herp", "derp", "blah", "what", "da.."])
>>> q.appendleft('wuggah')
>>> q.pop()
'da..'
>>> q
deque(['wuggah', 'herp', 'derp', 'blah', 'what'])

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