code: def once_via_next(self, start, end):
      # Not overridden, next must be there ...
      for i in range(start, end):
          for data in self.datas:
              data.advance()
  
          for indicator in self._lineiterators[LineIterator.IndType]:
              indicator.advance()
  
          self.advance()
          self.next()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from .utils.py3 import range, with_metaclass
  from .lineiterator import LineIterator, IndicatorBase
  from .lineseries import LineSeriesMaker, Lines
  from .metabase import AutoInfoClass
label_desc: Use image node_id 4 for calling the Indicator obj's underlying member method code with example usage: obj.once_via_next(start, end) without return types