code: def _plotlabel(self):
      plabels = []
      for name, value in self.params._getitems():
          plabels.append("%s: %s" % (name, value.strftime("%H:%M")))
  
      return plabels
  
file_path: backtrader/samples/relative-volume/relvolbybar.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import collections
  import datetime
  import math
  import backtrader
label_desc: Use image node_id 1 for calling the RelativeVolumeByBar obj's underlying member method code with example usage: obj._plotlabel() and returns: plabels