message: adds placeholder for xy placeable method
diff: @@ -622,6 +622,8 @@ class Container(Placeable):
  new_wells = WellSeries(self.get_children_list())
  elif len(args) > 1:
  new_wells = WellSeries([self.well(n) for n in args])
  + elif 'x' in kwargs or 'y' in kwargs:
  + new_wells = self._parse_wells_x_y(*args, **kwargs)
  else:
  new_wells = self._parse_wells_to_and_length(*args, **kwargs)
  @@ -674,6 +676,11 @@ class Container(Placeable):
  return WellSeries(
  wrapped_wells[start + total_kids::step][:length])
  + def _parse_wells_x_y(self, *args, **kwargs):
  + x = kwargs.get('x', None)
  + y = kwargs.get('y', None)
  +
  +
  class WellSeries(Container):
  """
  