code: def _urljoin(left, right):
      
  
      # Handle the tricky case of right being a full URL
      tmp = urlparse.urlparse(right)
      if tmp.scheme or tmp.netloc:
          # Go ahead and use urlparse.urljoin()
          return urlparse.urljoin(left, right)
  
      # Check for slashes
      joincond = (left[-1:], right[:1])
      if joincond == ('/', '/'):
          # Too many, preserve only one
          return left + right[1:]
      elif '/' in joincond:
          # Just one; great!
          return left + right
      else:
          # Not enough; add one
          return left + '/' + right
docs: Join two URLs.
  
      Takes URLs specified by left and right and joins them into a
      single URL.  If right is an absolute URL, it is returned directly.
      This differs from urlparse.urljoin() in that the latter always
      chops off the left-most component of left unless it is trailed by
      '/', which is not the behavior we want.