code: def prenext(self):
      self.next()
  
file_path: backtrader/samples/timers/scheduled.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import datetime
  import backtrader
label_desc: Use image node_id 2 for calling the St obj's underlying member method code with example usage: obj.prenext() without return types