208 – itertools.pairwise

itertools.pairwise accepts an iterable as its only argument and produces a sequence of overlapping pairs of consecutive elements:

from itertools import pairwise

queue = ["Harry", "Hermione", "Ron"]

for front, back in pairwise(queue):
    print(f"{front} is directly in front of {back}.")
# Harry is directly in front of Hermione.
# Hermione is directly in front of Ron.