code: def urljoin(base, url):
      
      import posixpath
      bscheme, bauthority, bpath, bquery, bfragment = urisplit(base)
      uscheme, uauthority, upath, uquery, ufragment = urisplit(url)
      if uscheme is not None and bscheme != uscheme:
          return url
      if uauthority is not None:
          bauthority, bpath, bquery, bfragment = \
              uauthority, upath, uquery, ufragment
      elif upath != '':
          bpath = posixpath.normpath(_pathjoin(_dirname(bpath), upath))
          bquery, bfragment = uquery, ufragment
      elif uquery is not None:
          bquery, bfragment = uquery, ufragment
      elif ufragment is not None:
          bfragment = ufragment
      return uriunsplit((bscheme, bauthority, bpath, bquery, bfragment))
docs: Join a base URL and a (possiby relative) URL.
  
      base - base url
      url - a (possibly relative) URL to join to the base URL
  
      Returns the result as an absolute URL.