code: def writeDrizKeywords(hdr,imgnum,drizdict):
      
      _keyprefix = 'D%03d'%imgnum
  
      for key in drizdict:
          val = drizdict[key]['value']
          if val is None: val = ""
          comment = drizdict[key]['comment']
          if comment is None: comment = ""
          hdr[_keyprefix+key] = (val, drizdict[key]['comment'])
docs: Write basic drizzle-related keywords out to image header as a record
          of the processing performed to create the image
  
          The dictionary 'drizdict' will contain the keywords and values to be
          written out to the header.