code: def convert(input, width=132, output=None, keep=False):
  
      
      # open input trailer file
      trl = open(input)
  
      # process all lines
      lines = np.array([i for text in trl.readlines() for i in textwrap.wrap(text,width=width)])
  
      # close ASCII trailer file now that we have processed all the lines
      trl.close()
  
      if output is None:
          # create fits file
          rootname,suffix = os.path.splitext(input)
          s = suffix[1:].replace('ra','rl')
          fitsname = "{}_{}{}fits".format(rootname,s,os.path.extsep)
      else:
          fitsname = output
      full_name = os.path.abspath(os.path.join(os.path.curdir,fitsname))
  
      old_file = os.path.exists(full_name)
      if old_file:
          if keep:
              print("ERROR: Trailer file already written out as: {}".format(full_name))
              raise IOError
          else:
              os.remove(full_name)
  
      # Build FITS table and write it out
      line_fmt = "{}A".format(width)
      tbhdu = fits.BinTableHDU.from_columns([fits.Column(name='TEXT_FILE',format=line_fmt,array=lines)])
      tbhdu.writeto(fitsname)
  
      print("Created output FITS filename for trailer:{}    {}".format(os.linesep,full_name))
  
      os.remove(input)
docs: Input ASCII trailer file "input" will be read.
  
      The contents will then be written out to a FITS file in the same format
      as used by 'stwfits' from IRAF.
  
      Parameters
      ===========
      input : str
          Filename of input ASCII trailer file
  
      width : int
          Number of characters wide to use for defining output FITS column
          [Default: 132]
  
      output : str
          Filename to use for writing out converted FITS trailer file
          If None, input filename will be converted from *.tra -> *_trl.fits
          [Default: None]
  
      keep : bool
          Specifies whether or not to keep any previously written FITS files
          [Default: False]