code: def _next(self):
      for child in self._children:
          child._next()
  
      if self._dt_over():
          self.on_dt_over()
  
      self.next()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import calendar
  from collections import OrderedDict
  import datetime
  import pprint
  import backtrader
  from backtrader import TimeFrame
  from backtrader.utils.py3 import MAXINT, with_metaclass
label_desc: Use image node_id 4 for calling the TimeFrameAnalyzerBase obj's underlying member method code with example usage: obj._next() without return types