Turn flat list into two-tuples [duplicate]

Question

Is there a single line expression to accomplish the following:

input = ['this', 'is', 'a', 'list']
output = [('this', 'is'), ('a', 'list')]

My initial idea was to create two lists and then zip them up. That would take three lines.

The list will have an even number of elements.

Answer 1

This is quite short:

zip(input, input[1:])[::2]

Answer 2

In [4]: zip(*[iter(lst)]*2)
Out[4]: [('this', 'is'), ('a', 'list')]

Answer 3

>>> input = ['this', 'is', 'a', 'list']

>>> [(input[i], input[i + 1]) for i in range(0, len(input), 2)]
[('this', 'is'), ('a', 'list')]