[AstroPy] Access to comments in astropy.io.asccii

[Aldcroft, Thomas]

On Sun, Nov 23, 2014 at 12:04 PM, Knox Long <long at stsci.edu> wrote:

>  I/we are trying to move to astropy.io.ascii.read for reading ascii.data,
> and for the most part this is working well.  However, we often also want
> access to comment lines in our ascii data and I have not found any way to
> do this.  Is there something I am missing.  Here is an example of what I
> would like to be able to read:
>
>  # TITLE= "test.ioncC3.dat"
> # Coord_Sys CYLIND
> x z var inwind i j
> 1.4000e+09 3.5000e+08 0.00e+00  -2   0   0
> 1.4000e+09 8.0805e+08 0.00e+00  -1   0   1
> 1.4000e+09 1.0575e+09 0.00e+00  -1   0   2
> 1.4000e+09 1.3840e+09 0.00e+00  -1   0   3
> 1.4000e+09 1.8113e+09 0.00e+00  -1   0   4
> 1.4000e+09 2.3705e+09 0.00e+00  -1   0   5
> 1.4000e+09 3.1023e+09 0.00e+00  -1   0   6
> 1.4000e+09 4.0600e+09 0.00e+00  -1   0   7
>

Hi Knox,

Getting the comment lines is possible in your case with the following:

>>> from astropy.io import ascii
>>> reader = ascii.get_reader(Reader=ascii.Basic)
>>> dat = reader.read(filename)
>>> comments = reader.comment_lines

This is not terribly convenient, and you cannot guess the format, etc.
I've submitted an issue (https://github.com/astropy/astropy/issues/3136)
and hopefully we can make a better mechanism.  This has occurred to me
before as a problem.

Cheers,
Tom



>  Thanks,
> Knox
>
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