No option to write a fixed-width table with a commented header #4112

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1. embray commented on Aug 31, 2015

   

   embray

   on Aug 31, 2015

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   This can probably be done like in the CommentedHeaderHeader example here: http://docs.astropy.org/en/stable/io/ascii/read.html#advanced-customization but with a FixedWidthHeader as the base class. It would have to offset everything to include space for the comment character.
2. embray

   added

   Feature Request

   io.ascii

   Affects-release

   on Aug 31, 2015
3. taldcroft commented on Sep 4, 2015

   

   taldcroft

   on Sep 4, 2015

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   A less elegant but simpler workaround would be to just write the file to a StringIO object and then paste in a leading #:

   t = .. # my table
   out = StringIO.StringIO()
   t.write(out, format='ascii.fixed_width', delimiter=None)
   with open('outfile.dat', 'w') as fh:
       fh.write('#' + out.getvalue())
   

   This cannot be used for a table that has strings with space characters embedded. The fixed_width format does not quote those.
4. pllim

   removed

   Affects-release

   on Mar 30, 2020
5. hamogu commented on Aug 8, 2022

   

   hamogu

   on Aug 8, 2022

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   I suggest to write a good example for this to add top the docs on advance customization.
6. pllim

   closed this as completedin #17630on Jan 15, 2025