code: def append_data(dset, data):
      
      N = data.shape[0] if hasattr(data, 'shape') else 1
      if N == 0:
          return
      oldlen = dset.shape[0]
      newlen = oldlen + N
      dset.resize(newlen, axis=0)
      dset[oldlen:] = data
docs: Append data to dset along axis 0. Data must be a single element or
      a 1D array of the same type as the dataset (including compound datatypes).