Pythonic way to combine two lists in an alternating fashion?

Question

I have two lists, the first of which is guaranteed to contain exactly one more item than the second. I would like to know the most Pythonic way to create a

Answer 1

from itertools import chain
list(chain(*zip('abc', 'def')))  # Note: this only works for lists of equal length
['a', 'd', 'b', 'e', 'c', 'f']