[AstroPy] Fwd: Help with encoding error

[Leticia Rodriguez]

Thanks for all the answers.

Leticia.


2013/10/2 Perry Greenfield <stsci.perry at gmail.com>

>
> On Oct 2, 2013, at 10:19 AM, Leticia Rodriguez wrote:
>
> > Hi,
> >
> > I want to use the "ñ" character in a fit header. The verify in astropy
> is giving me an error.
> >
> > WARNING: VerifyWarning:         Card 'OBSERVER' is not FITS standard
> (invalid value string: 'Maria Rosa Mu�oz ').  Fixed 'OBSERVER' card to meet
> the FITS standard. [astropy.io.fits.verify]
> > ERROR: UnicodeDecodeError: 'ascii' codec can't decode byte 0xf1 in
> position 1946: ordinal not in range(128) [astropy.io.fits.header]
> > Traceback (most recent call last):
> >   File "./fixfitheader.py", line 30, in <module>
> >     hdulist.writeto(sys.argv[2]+'/'+filename, output_verify='fix')
> >   File
> "/usr/local/lib/python2.6/dist-packages/astropy/io/fits/hdu/hdulist.py",
> line 675, in writeto
> >     hdu._writeto(hdulist.__file)
> >   File
> "/usr/local/lib/python2.6/dist-packages/astropy/io/fits/hdu/base.py", line
> 497, in _writeto
> >     self._writeheader(fileobj)
> >   File
> "/usr/local/lib/python2.6/dist-packages/astropy/io/fits/hdu/base.py", line
> 428, in _writeheader
> >     self._header.tofile(fileobj)
> >   File
> "/usr/local/lib/python2.6/dist-packages/astropy/io/fits/header.py", line
> 625, in tofile
> >     fileobj.write(blocks.encode('ascii'))
> > UnicodeDecodeError: 'ascii' codec can't decode byte 0xf1 in position
> 1946: ordinal not in range(128)
> >
> > Is there a solution for this issue?
> >
> Yes, don't use FITS. :-) But seriously, here's what the FITS standard says
> about headers:
>
> 3.2. Individual FITS Structures
>
> The primary HDU and every extension HDU shall consist of one or more
> 2880-byte header blocks immediately followed by an optional sequence of
> associated 2880-byte data blocks. The header blocks shall contain only the
> restricted set of ASCII text characters, decimal 32 through 126
> (hexadecimal 20 through 7E). The ASCII control characters with decimal
> values less than 32 (including the null, tab, carriage return, and line
> feed characters), and the delete character (decimal 127 or hexadecimal 7F)
> must not appear anywhere within a header block
>
> So basically, the character you want is illegal in a FITS header. So no,
> there isn't a simple solution.
>
> Perry
>
>
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