parse string of integer sets with intervals to list

Question

I have \"2,5,7-9,12\" string.

I want to get [2, 5, 7, 8, 9, 12] list from it.

Is there any built-in function for it in python?

Thanks.

Answer 1

I would define function:

def make_range(s):
    out = []
    s = s.split(',')
    for n in s:
        if '-' in n:
            n = n.split('-')
            for i in range(int(n[0]), int(n[1]) + 1):
                out.append(i)
        else:
            out.append(int(n))
    return out

print make_range("2,5,7-9,12")
#output [2, 5, 7, 8, 9, 12]