docs: def IPID_count(lst, funcID=lambda x: x[1].id, funcpres=lambda x: x[1].summary()):  # noqa: E501
      """Identify IP id values classes in a list of packets
  
  lst:      a list of packets
  funcID:   a function that returns IP id values
  funcpres: a function used to summarize packets"""
      idlst = [funcID(e) for e in lst]
      idlst.sort()
      classes = [idlst[0]]
      classes += [t[1] for t in zip(idlst[:-1], idlst[1:]) if abs(t[0] - t[1]) > 50]  # noqa: E501
      lst = [(funcID(x), funcpres(x)) for x in lst]
      lst.sort()
      print("Probably %i classes:" % len(classes), classes)
      for id, pr in lst:
          print("%5i" % id, pr)