code: def randomport(min=1024, max=65536):
      """select a random port number
  
      Args:
          min -- minimum port number  [default = 1024]
          max -- maximum port number  [default = 65536]
      """
      return portnumber(min, max)()
  
label_desc: Use image node_id 1 for calling a global function with example usage: randomport(min, max) and returns: portnumber