iterate over consecutive pairs

pairs.py

def pairs(seq, cyclic=True):
    it = iter(seq)
    first = prev = next(it)
    for here in it:
        yield prev, here
        prev = here
    if cyclic:
        yield here, first
# I use this snippet in almost every script
# It is really simple but still I would prefer to import it from itertools if it was there...
# If you know of a more elegant way to do this, please give me a note