old_contents: import warnings
  
  import numpy
  
  from simphony.testing.utils import dummy_cuba_value
  
  
  class CUDSDataAccumulator(object):
      """ Accumulate data information per CUBA key.
  
      """
      def __init__(self, keys=()):
          self._keys = set(keys)
          self._expand_mode = len(keys) == 0
          self._data = {}
          self._record_size = 0
          self._expand(self._keys)
  
      @property
      def keys(self):
          return set(self._keys)
  
      def append(self, data):
          if self._expand_mode:
              new_keys = set(data.keys()) - self._keys
              self._keys.update(new_keys)
              self._expand(new_keys)
          for key in self._keys:
              self._data[key].append(data.get(key, None))
          self._record_size += 1
  
      def _expand(self, keys):
          for key in keys:
              self._data[key] = [None] * self._record_size
  
      def __len__(self):
          return self._record_size
  
      def __getitem__(self, key):
          return self._data[key]
  
      def load_onto_vtk(self, vtk_data):
          for cuba in self.keys:
              default = dummy_cuba_value(cuba)
              if isinstance(default, (float, int)):
                  data = numpy.array(self._data[cuba], dtype=float)
                  index = vtk_data.add_array(data)
                  vtk_data.get_array(index).name = cuba.name
              else:
                  message = 'proprrty {!r} is currently ignored'
                  warnings.warn(message.format(cuba))
  
  
new_contents: import warnings
  
  import numpy
  
  from simphony.testing.utils import dummy_cuba_value
  
  
  class CUDSDataAccumulator(object):
      """ Accumulate data information per CUBA key.
  
      """
      def __init__(self, keys=()):
          self._keys = set(keys)
          self._expand_mode = len(keys) == 0
          self._data = {}
          self._record_size = 0
          self._expand(self._keys)
  
      @property
      def keys(self):
          return set(self._keys)
  
      def append(self, data):
          if self._expand_mode:
              new_keys = set(data.keys()) - self._keys
              self._keys.update(new_keys)
              self._expand(new_keys)
          for key in self._keys:
              self._data[key].append(data.get(key, None))
          self._record_size += 1
  
      def _expand(self, keys):
          for key in keys:
              self._data[key] = [None] * self._record_size
  
      def __len__(self):
          return self._record_size
  
      def __getitem__(self, key):
          return self._data[key]
  
      def load_onto_vtk(self, vtk_data):
          for cuba in self.keys:
              default = dummy_cuba_value(cuba)
              if isinstance(default, (float, int)):
                  data = numpy.array(self._data[cuba], dtype=float)
                  index = vtk_data.add_array(data)
                  vtk_data.get_array(index).name = cuba.name
              else:
                  message = 'property {!r} is currently ignored'
                  warnings.warn(message.format(cuba))
  
subject: fix typo