code: def make_us_postal_code(s, allowed_lengths=(), allowed_digits=()):
      
      allowed_lengths = allowed_lengths or tuple(N if N < 6 else N + 1 for N in allowed_digits)
      allowed_lengths = allowed_lengths or (2, 3, 5, 10)
      ints = int_pair(s)
      z = str(ints[0]) if ints[0] else ''
      z4 = '-' + str(ints[1]) if ints[1] else ''
      if len(z) == 4:
          z = '0' + z
      if len(z + z4) in allowed_lengths:
          return z + z4
      elif len(z) in (min(l, 5) for l in allowed_lengths):
          return z
      return ''
docs: >>> make_us_postal_code(1234)
      '01234'
      >>> make_us_postal_code(507.6009)
      '507'
      >>> make_us_postal_code(90210.0)
      '90210'
      >>> make_us_postal_code(39567.7226)
      '39567-7226'
      >>> make_us_postal_code(39567.7226)
      '39567-7226'