>> string = '1-6,8-23,25-26'
>> [range(*z) + [z[-1]] for z in [tuple(y) for y in [[int(y) for y in x.split('-')] for x in string.split(',')]]]

>>[[1, 2, 3, 4, 5, 6], [8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23], [25, 26]]

>> string = '1-2,3-4,6-9,12-20,22-30'
>> map(lambda x: range(*x) + [x[-1]], map(tuple, [[int(y) for y in x.split('-')] for x in string.split(',')]))
>> [[1, 2], [3, 4], [6, 7, 8, 9], [12, 13, 14, 15, 16, 17, 18, 19, 20], [22, 23, 24, 25, 26, 27, 28, 29, 30]]

[range(*z) + [z[-1]] for z in map(tuple, [[int(y) for y in x.split('-')] for x in string.split(',')])]

s = '1-6,8-23,25-26'
result = []
for p in s.split(','):
    sp = map(int, p.split('-'))
    result.extend(range(sp[0], sp[1]+1))
print ','.join(map(str, result))

print ','.join(map(str, sum(map(lambda t:range(t[0], t[1]+1), [map(int, p.split('-')) for p in s.split(',')]), [])))

','.join(map(str, eval(re.sub(r'(\d+)-(\d+)', r'range(\1,\2+1)', re.sub(',', '+', s)))))