CODEWITHSUNDEEP
python
cclloyd
cclloyd

Reputation: 9205

Python Extend List when declaring list

In Javascript, I can do something like this

let list = [1, 2, 3]
let list2 = [4, 5, 6, ...list]

And the resulting list would be [4,5,6,1,2,3]

Is there a way to do this in Python without having to call extend() or using += after declaring the list?

Upvotes: 1

Views: 47

Answers (1)

ShadowRanger
ShadowRanger

Reputation: 155418

The additional unpacking generalizations of PEP 448 (added in Python 3.5) allows the following syntax:

list2 = [4, 5, 6, *list]

The elements of the first list are unpacked, one after another, in the same order they appear in the original list.

Prior to 3.5, the best solution is just:

list2 = [4, 5, 6] + list

which is still a one-liner, but has to construct the temporary list first, then concatenate the two of them and throw away the temporary.

Upvotes: 3

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