python decompose a list

Question

I remember I once seen a operator which is able to decompose a list in python.

for example

[[1],[2],[3]]

by applying that operator, you get

[1], [2], [3]

what is that operator, any help will be appreciated.

Answer 1

If you want to pass a list of arguments to a function, you can use *, the splat operator. Here's how it works:

list = [1, 2, 3]
function_that_takes_3_arguments(*list)

If you want to assign the contents of a list to a variable, you can list unpacking:

a, b, c = list # a=1, b=2, c=3