Python: how to simultaneously add two lists to a list?

Question

Let's say I have a list

l1 = []

another list

l2 = ['a','b']

and two variables

u = 1
z = 2

Now I would like to add l2 to l1 and the two variables as a list to l1 as well. One can do it in two steps using append:

l1.append(l2)
l1.append(list((u,z)))

which gives me the desired output

[['a', 'b'], [1, 0]]

But something like

l1.append(l2, list((u,z)))

does not work. Is there a way to get the same output I obtain for the two steps in a nice oneliner i.e. can one simultaneously append a list by two lists?

Answer 1

l1.extend([l2, [u,z]])

append can only add one element to a list. extend takes a list and adds all the elements in it to other list.