python爬虫,接口是post请求,参数是request payload 的形式,如何传参

 

    payload = {
        "tmpFdt": eta,
        "tmpNacd": pol_code_ex,
        "tmpPod": tmpPod,
        "tmpPol": tmpPol
    }

    # 传json格式的参数
    jdata = json.dumps(payload)
　　

    res = session.post(t_url, timeout=20, data=jdata, headers=headers)