code: def fix_multiple_files(filenames, options, output=None):
      
      results = []
      filenames = find_files(filenames, options.recursive, options.exclude)
      if options.jobs > 1:
          import multiprocessing
          pool = multiprocessing.Pool(options.jobs)
          ret = pool.map(_fix_file, [(name, options) for name in filenames])
          results.extend([x for x in ret if x is not None])
      else:
          for name in filenames:
              ret = _fix_file((name, options, output))
              if ret is None:
                  continue
              if options.diff:
                  if ret != '':
                      results.append(ret)
              elif options.in_place:
                  results.append(ret)
              else:
                  original_source = readlines_from_file(name)
                  if "".join(original_source).splitlines() != ret.splitlines():
                      results.append(ret)
      return results
docs: Fix list of files.
  
      Optionally fix files recursively.