code: def create_dset(self, key, dtype, shape=(None,), compression=None,
                      fillvalue=0, attrs=None):
          
          return hdf5.create(
              self.hdf5, key, dtype, shape, compression, fillvalue, attrs)
docs: Create a one-dimensional HDF5 dataset.
  
          :param key: name of the dataset
          :param dtype: dtype of the dataset (usually composite)
          :param shape: shape of the dataset, possibly extendable
          :param compression: the kind of HDF5 compression to use
          :param attrs: dictionary of attributes of the dataset
          :returns: a HDF5 dataset