python爬虫之多线程爬取菜价

import requests, csv,time
from concurrent.futures import ThreadPoolExecutor

f = open("data.csv", mode="w", encoding="utf-8")
csvwriter = csv.writer(f)
#获取程序开始运行时间
now1=time.time()

def download_one_page(url,headers,data):
    time.sleep(2)#增加爬取次数之间的时间间隔
    resp = requests.post(url, headers=headers, data=data)
    print(time.strftime("%Y-%m-%d %H:%M:%S"),resp.status_code)
    list = resp.json().get('list')
    for dic in list:
        txt=(dic.get("prodCat"), dic.get("prodName"), dic.get("lowPrice"), dic.get("avgPrice"),
            dic.get("highPrice"), dic.get("specInfo"), dic.get("place"), dic.get("unitInfo"), dic.get("pubDate"))
        csvwriter.writerow(txt)

if __name__ == '__main__':
    with ThreadPoolExecutor(5) as t:
        for i in range(1,13845):
            url = "http://www.xinfadi.com.cn/getPriceData.html"
            headers = {
                "User-Agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.39",
                "Referer": "http://www.xinfadi.com.cn/priceDetail.html"
            }
            data = {
                "limit": "20",
                "current":i
            }
            t.submit(download_one_page(url,headers,data))
            print("第",i,"页下载完毕")
    #获取程序运行完时间
    now2 = time.time()
    print("全部下载完毕,耗时：",int(now2-now1),"秒")