code: def advance(self, size=1):
      # Need intercepting this call to support datas with
      # different lengths (timeframes)
      if len(self) < len(self._clock):
          self.lines.advance(size=size)
  
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 1 for calling the Indicator obj's underlying member method code with example usage: obj.advance(size) without return types