code: def getwriterheaders(self):
      headers = [self._name, "len"]
  
      for lo in self.LineOrder:
          headers.append(self._getlinealias(lo))
  
      morelines = self.getlinealiases()[len(self.LineOrder) :]
      headers.extend(morelines)
  
      return headers
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import datetime
  from datetime import datetime
  import inspect
  from .utils.py3 import range, with_metaclass
  from .lineseries import LineSeries
  from .utils import AutoOrderedDict, OrderedDict, date2num
label_desc: Use image node_id 1 for calling the DataSeries obj's underlying member method code with example usage: obj.getwriterheaders() and returns: headers