convert sequences in string simular to "1,4,8-12,14" to generator of sequence 1,4,8,9,10,11,12,14

seq_gen.py

# gen sequence i.e. "1,3,5-7,9" > [1,3,5,6,7,9]
def seq_gen(s):
  for item in s.split(','):
      if '-' in item:
          a, b = map(int, item.split('-'))
          for i in range(a,b+1):
              yield i
      else:
          if len(item):
              yield int(item)

print(list(seq_gen("1,3,5-7,9")))