code: def plot(self, f, lfilter=None, plot_xy=False, **kargs):
          
  
          # Python 2 backward compatibility
          f = lambda_tuple_converter(f)
          lfilter = lambda_tuple_converter(lfilter)
  
          # Get the list of packets
          if lfilter is None:
              lst_pkts = [f(*e) for e in self.res]
          else:
              lst_pkts = [f(*e) for e in self.res if lfilter(*e)]
  
          # Mimic the default gnuplot output
          if kargs == {}:
              kargs = MATPLOTLIB_DEFAULT_PLOT_KARGS
          if plot_xy:
              lines = plt.plot(*zip(*lst_pkts), **kargs)
          else:
              lines = plt.plot(lst_pkts, **kargs)
  
          # Call show() if matplotlib is not inlined
          if not MATPLOTLIB_INLINED:
              plt.show()
  
          return lines
docs: Applies a function to each packet to get a value that will be plotted
          with matplotlib. A list of matplotlib.lines.Line2D is returned.
  
          lfilter: a truth function that decides whether a packet must be plotted