Converting a deque object into list

Question

Currently, I fetch "list" data from my storage, "deque" it to work with that data.

After processing the fetched data, I have to put them back into the storage. This won't be a problem as long as I am not forced to use Python's standard "list" object to save this data.

Storage Service: Google Appengine.

My work-around would be:

dequeObj = deque(myData)
my_list = list()
for obj in dequeObj:
    my_list.append(obj)

but this seems not very optimal.

Ignacio Vazquez-Abrams · Accepted Answer · 2011-04-24 21:40:20Z

121

>>> list(collections.deque((1, 2, 3)))
[1, 2, 3]

answered Apr 24, 2011 at 21:40

Ignacio Vazquez-Abrams

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1 Comment

pjz Over a year ago

nb. This works because a deque is iterable, and list() will make list from an iterable. (eg. list(range(5)))

cottontail · Accepted Answer · 2023-02-02 08:08:47Z

2

Since deques are iterables, you can also unpack it inside a list.

dq = collections.deque([1, 2, 3])
lst = [*dq]
lst             # [1, 2, 3]

To create a new list object, you can even pack the deque into a variable as well.

*lst, = dq
lst             # [1, 2, 3]

answered Feb 2, 2023 at 8:08

cottontail

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