docs: async def main():
      """ Main class."""
      opts, args = option_parser()
      url = args[0]
  
      if opts.links:
          getlinks(url)
          raise SystemExit(0)
  
      depth = opts.depth
  
      sTime = time.time()
      webcrawler = Webcrawler(url, depth)
      webcrawler.crawl()
      eTime = time.time()
      tTime = eTime - sTime
      print("CRAWLER STARTED:")
      print("%s, will crawl upto depth %d" % (url, depth))
      print("*****RESULTS")
      print("\n".join(webcrawler.urls))
      print("=" * 100)
      print("Crawler Statistics")
      print("=" * 100)
      print("No of links Found: %d" % webcrawler.links)
      print("No of followed:     %d" % webcrawler.followed)
      print("Time Stats : Found all links  after %0.2fs" % tTime)