Get a slice of an array

Questions
1

How can I get a slice of an array, e.g. (in python I would write) [1,2,3,4][0:2] to get [1,2]

2

In SC:
[1, 2, 3, 4][0..1]

Or even shorter:

[1, 2, 3, 4][..1]

Similarly you can get the last two indices with either

[1, 2, 3, 4][2..3]

or

[1, 2, 3, 4][2..]