code: def nextstart(self):
      print("--------------------------------------------------")
      print("nextstart called with len", len(self))
      print("--------------------------------------------------")
  
      super(SMAStrategy, self).nextstart()
  
file_path: backtrader/samples/data-multitimeframe/data-multitimeframe.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import backtrader
  import backtrader.feeds
  import backtrader.indicators
  from backtrader import ResamplerDaily, ResamplerWeekly, ResamplerMonthly
  from backtrader import ReplayerDaily, ReplayerWeekly, ReplayerMonthly
  from backtrader.utils import flushfile
label_desc: Use image node_id 3 for calling the SMAStrategy obj's underlying member method code with example usage: obj.nextstart() without return types