code: def get(f, key, default=None):
      
  
      if key in f.keys():
          val = f[key].value
  
          if default is None:
              return val
          else:
              if _np.shape(val) == _np.shape(default):
                  return val
  
      return default
docs: Gets an array from datasets.
  
      .. versionadded:: 1.4