convert string ranges list python

1def f(x):
2    result = []
3    for part in x.split(','):
4        if '-' in part:
5            a, b = part.split('-')
6            a, b = int(a), int(b)
7            result.extend(range(a, b + 1))
8        else:
9            a = int(part)
10            result.append(a)
11    return result