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

我有一个 list 大约 40 个条目.我经常想将一个项目附加到列表的开头(id 为 0)，并想删除列表的 last 条目(id 为 40).

我该如何做到最好?

包含 5 个条目的示例:

[0] = "herp"[1] = "derp"[2] = "废话"[3] = "什么"[4] = "大..."

添加"wuggah"并删除最后它应该是这样的:

[0] = "wuggah"[1] = "疱疹"[2] = "derp"[3] = "废话"[4] = "什么"

而且我不想最终手动将所有条目一个接一个地移动到下一个 ID.

解决方案

使用 collections.deque:

<预><代码>>>>进口藏品>>>q = collections.deque(["herp", "derp", "blah", "what", "da.."])>>>q.appendleft('wuggah')>>>q.pop()'哒..'>>>qdeque(['wuggah', 'herp', 'derp', 'blah', 'what'])

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.

How do I do this the best?

Example with 5 entries:

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

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

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

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

解决方案

Use collections.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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