无法在 Python 中创建 HDF5 数据集的引用

Question

I am using the HDF5 python lib h5py and want to create a reference from an HDF5 dataset by

ref = DATASET.regionref[:, :, 0]

However, I receive an error

 ValueError: Unable to create reference (No write intent on file)

In fact, I haven't and don't want to open the file with write access. What can I do?

Answer 1

It seems h5py does not allow region references if the file isn't opened with write access. The reason may be that these references act as numpy arrays allowing reading and writing .

I didn't find much mentioning of region references in the HDF5 format specification , so I guess one could in principle make them read only. This might be a possible request for enhancement for h5py.

For the time being I would rather use views/slices on the numpy array directly if that is okay with your needs.