class_docstr: Base class for data series.
  
  .. note::
      This is a base class and should not be used directly.
class_docstr_tok: ["Base","class","for","data","series",".","..","note",":",":","This","is","a","base","class","and","should","not","be","used","directly","."]
docstr: Returns a list of :class:`datetime.datetime` associated with each value.
docstr_tok: ["Returns","a","list","of",":","class",":","`","datetime.datetime","`","associated","with","each","value","."]
code: def getDateTimes(self):
      """Returns a list of :class:`datetime.datetime` associated with each value."""
      raise NotImplementedError()
  
imports: import abc
  import six
  from six.moves import xrange
  from pyalgotrade import observer
  from pyalgotrade.utils import collections
label_desc: Use image node_id 4 for calling the DataSeries obj's underlying member method code with example usage: obj.getDateTimes() without return types