kgaughan

from itertools import chain

def parse_range(rng):
    parts = rng.split('-')
    if 1 > len(parts) > 2:
        raise ValueError("Bad range: '%s'" % (rng,))
    parts = [int(i) for i in parts]
    start = parts[0]
    end = start if len(parts) == 1 else parts[1]
    if start > end: