code: def get_host(url):
      
      # This code is actually similar to urlparse.urlsplit, but much
      # simplified for our needs.
      port = None
      scheme = 'http'
      if '//' in url:
          scheme, url = url.split('://', 1)
      if '/' in url:
          url, _path = url.split('/', 1)
      if ':' in url:
          url, port = url.split(':', 1)
          port = int(port)
      return scheme, url, port
docs: Given a url, return its scheme, host and port (None if it's not there).
  
      For example: ::
  
          >>> get_host('http://google.com/mail/')
          ('http', 'google.com', None)
          >>> get_host('google.com:80')
          ('http', 'google.com', 80)