code: def get_scraperclasses():
      
      global _scraperclasses
      if _scraperclasses is None:
          out.debug(u"Loading comic modules...")
          modules = loader.get_modules('plugins')
          plugins = loader.get_plugins(modules, Scraper)
          _scraperclasses = list(plugins)
          check_scrapers()
          out.debug(u"... %d modules loaded." % len(_scraperclasses))
      return _scraperclasses
docs: Find all comic scraper classes in the plugins directory.
      The result is cached.
      @return: list of Scraper classes
      @rtype: list of Scraper