code: def _barisvalid(self, tm):
      return self.p.start <= tm <= self.p.end
  
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 3 for calling the RelativeVolumeByBar obj's underlying member method code with example usage: obj._barisvalid(tm) and returns: unknown