code: def clear_file_format_cache():
      
      for fname, cache_info in file_cache.items():
          for format, lines in cache_info.lines.items():
              if 'plain' == format: continue
              file_cache[fname].lines[format] = None
              pass
          pass
      pass
docs: Remove syntax-formatted lines in the cache. Use this
      when you change the Pygments syntax or Token formatting
      and want to redo how files may have previously been
      syntax marked.