[AstroPy] units in ascii read/write?

[Tom Aldcroft]

Hi Rolf,

Unfortunately units parsing isn't currently supported in the SExtractor
format.

This should be relatively easy to add, but biggest question is about the
format of the header lines that provide the units.  In the example you
showed the column definition line ends with an optional set of units within
square brackets like [eV].  Are there any other variations in the header
format possible?  I looked at the SExtractor manual but there is no
specification of the output format(s).  My guess for a rule is that if a
header line ends with something in square brackets then that is a unit.  Do
you think that will work?  (I don't use SExtractor myself).

This is now issue 1093:
  https://github.com/astropy/astropy/issues/1093

Thanks,
Tom


On Wed, May 15, 2013 at 4:29 AM, Rolf Buehler <rolf.buehler at desy.de> wrote:

> Dear  Astropy developers,
> thank you for this great tool, I have been looking for something like
> this for a long time.
> I have a problem when reading in ascii files, the units dont get read
> nor saved in the  ascii.SExtractor format. Below I post more details.
> Could you please tell me if this is currently a missinf feature or I am
> doing something wrong?
> Thank you again and cheers,
> Rolf
>
> Example file I am reading:
> #    1    flux    Fluss    [eV]
> #    2    time    Zeit    [MJD]
> 1    34
> 3    56
>
> data =
>
> ascii.read("sextractor.dat",Reader=ascii.SExtractor,guess=False,delimiter='\t',comment="#")
>
> After I get:
>
> In [49]: data["flux"]
> Out[49]:
> <Column name='flux' units=None format=None description=None>
> array([1, 3])
>
> So units are not there.
>
> --
> +49 337627-7249
> www.rolfbuehler.net
>
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>
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