Is Python list.extend() Order Presserving?

Question

I'm wondering whether the extend function preserves the order in the two list.

>> list = [1, 2, 3]
>> list.extend([4, 5])
>> list
[1, 2, 3, 4, 5]

Is extend always working like that way?

Answer 1

Yes.

list.extend() just extends the arguments given to the end of the list.

According to the docs:

Extend the list by appending all the items in the given list; equivalent to a[len(a):] = L.

So:

>>> a = [1, 2, 3]
>>> a[len(a):] = [4, 5]
>>> a
[1, 2, 3, 4, 5]

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By the way, don't shadow the built-in type by naming a list list.