Append elements of a set to a list in Python

Question

How do you append the elements of a set to a list in Python in the most succinct way?

>>> a = [1,2]
>>> b = set([3,4])
>>> a.append(list(b))
>>> a
[1, 2, [3, 4]]

But what I want is:

[1, 2, 3, 4]

Answer 1

Use

a.extend(list(b))

or even easier

a.extend(b)

instead.