def f(x):
    result = []
    for part in x.split(','):
        if '-' in part:
            a, b = part.split('-')
            a, b = int(a), int(b)
            result.extend(range(a, b + 1))
        else:
            a = int(part)
            result.append(a)
    return result

>>> f('1,2,5-7,10')
[1, 2, 5, 6, 7, 10]