code: def next(self):
      self.logdata()
      if not self.data_live:
          return
  
file_path: backtrader/samples/ib-cash-bid-ask/ib-cash-bid-ask.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import backtrader
  import datetime
label_desc: Use image node_id 3 for calling the St obj's underlying member method code with example usage: obj.next() without return types