# Is HDF5 or the Python interface h5py supported in Sage?

I am saving very large list objects to disk using the `save()`

command in Sage, which is utilizing Python's Pickles package. There is a known deficiency/bug that is unlikely to go away, namely that deeply buried in the compression code in the Python standard library that Pickles and therefore `save()`

use, there are legacy 32-bit integers that result in a serious limitation in using `save()`

with even moderately large (hundreds of MB) objects. See OverflowError: size does not fit in an int. The h5py package provides a Python interface to the HDF5 library and HDF5 can deal with multiple terabytes easily. Does anyone know if h5py is/will be implemented in Sage? Is there another alternative to `save()`

in Sage to save objects to disk?

I will state the obvious and say that Python is part of Sage... could you just use

`h5py`

directly from Sage's Python? You would have to install it first but unless it requires Python 3 that should be pretty straightforward using`sage -sh`

and then`pip install`

, or even the Sage subcommand`sage -pip install foo`

.Looks like Sage Math Cloud has it installed.