大佬们 ，为什么bs4只能提取一组数据？？？

import requests
from bs4 import BeautifulSoup
import csv
url="http://u_www.xinfadi.com.cn/marketanalysis/0/list/1.shtml"
resp=requests.get(url)

f=open("菜价.csv",mode="w",encoding="utf-8")
csvwriter=csv.writer(f)
be=BeautifulSoup(resp.text,"html.parser")
table=be.find("table",class_="hq_table")
# table=be.find("table",attrs={ "class":"hq_table"})

trs=table.find_all("tr")[1:]
for tr in trs :
        tds=tr.find_all("td")
        name = tds[0].text
        q = tds[1].text
        w = tds[2].text
        e = tds[3].text
        r = tds[4].text
        t = tds[5].text
        y = tds[6].text
csvwriter.writerow([name,q,w,e,r,t,y])

把csvwriter.writerow([name,q,w,e,r,t,y])放入for 循环内。