code: def notify_timer(self, timer, when, *args, **kwargs):
      print(
          "strategy notify_timer with tid {}, when {} cheat {}".format(
              timer.p.tid, when, timer.p.cheat
          )
      )
  
      if self.order is None and timer.p.cheat:
          print(
              "-- {} Create buy order".format(self.data.datetime.date())
          )
          self.order = self.buy()
  
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 4 for calling the St obj's underlying member method code with example usage: obj.notify_timer(timer, when) without return types