code: def write_cookies_to_cache(cj, username):
      
      mkdir_p(PATH_COOKIES, 0o700)
      path = get_cookies_cache_path(username)
      cached_cj = cookielib.MozillaCookieJar()
      for cookie in cj:
          cached_cj.set_cookie(cookie)
      cached_cj.save(path)
docs: Save RequestsCookieJar to disk in Mozilla's cookies.txt file format.
  
      This prevents us from repeated authentications on the
      accounts.coursera.org and class.coursera.org/class_name sites.