IDL SAVE XDR format file reading in PHYTON

Option 1:

- from https://stackoverflow.com/questions/65433407/open-xdr-file-in-python

- This functionality is built into scipy now:
  from scipy.io import readsav data=readsav("filename.xdr") print(data)
  The result ("data") should be self-explanatory, with the names of the
  variables as originally saved in IDL.

Option 2:

- from https://www.astrobetter.com/blog/2009/11/24/read-idl-save-files-into-python/

- I developed IDLSave, a package to read IDL ‘save’ files into Python, after
  being sent a few such files by collaborators. In this package, scalars are
  converted to their respective Python types, while arrays and structures are
  mapped to Numpy arrays and recarrays respectively.

- Using IDLSave is easy. Let’s say you (or a collaborator) writes a save file with
  IDL> save, wavelength, flux, file='spectrum.sav'
  you will now be able to open this file in Python using
  >>> import idlsave
  >>> s = idlsave.read('spectrum.sav')
  after which you will be able to access the values using s.wavelength and s.flux.

- Source: https://sourceforge.net/projects/idlsave/