[AstroPy] Catching an AstropyUserWarning as an exception

[Ivan Valtchanov]

Thanks Derek,

Tried your suggestion with verify(option='exception') and it isn't raising
an exception, probably because the file is incomplete, but it passes the
verify() check.

So, I will try to set a warningfilter and see if I can make it raise an
exception.

Cheers,
Ivan




On Thu, 9 May 2024 at 15:39, Homeier, Derek <dhomeie at gwdg.de> wrote:

> :On 9 May 2024, at 1:44 PM, Ivan Valtchanov <ivvv68 at gmail.com> wrote:
> >
> > I am trying to figure out how to raise an exception for corrupted FITS
> files (unreliable ftp download of partial files). I have tried this
> approach but it doesn't seem to work and I could not find anything relevant
> in the docs.
> >
> > ###
> > from astropy.io import fits
> >
> > with fits.open('myfile.fits') as hdu:
> >    try:
> >       a = hdu.verify()
> >    except AstropyUserWarning:
> >       print ('Corrupt file, re-downloading")
> >
> A warning is not an exception, unless you set up a corresponding
> warningfilter.
> But setting the appropriate option in `verify` should do it the easiest
> way:
>
>    try:
>       a = hdu.verify(option=‘exception')
>    except astropy.io.fits.verify.VerifyError:
>       ...
>
> HTH
>                                         Derek
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