from lxml import etree
 requests
 re
headers = {
    'user-agent': Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/74.0.3729.131 Safari/537.36',}
#session请求 拿到cookies
sessions = requests.Session() 创建一个session对象

 sessions.get(z_url,headers=headers)  #发送请求


url = http://www.agri.cn/V20/SC/jcyj_1/

ret = sessions.get(url=url,headers=headers)
ret.encoding="utf-8"
ret_text =ret.text


tree= etree.HTML(ret_text)
#

li_list = tree.xpath(/html/body/table[3]//tr/td[1]/table[2]//tr/td/table[2]//tr/td[1]/a/script/text())[0]
print(li_list)
 document.write(tit1_('<a href="./202005/t20200513_7387962.htm">5月份第1周畜产品和饲料集贸市场价格情况</a>')); 

dta = re.findall(htm">(.*)</a>(dta)
 ['5月份第1周畜产品和饲料集贸市场价格情况']