爬虫爬出的数据，print输出可以全部输出，但是写入CSV文件时只能写最后一行

Question

问题遇到的现象和发生背景

问题相关代码，请勿粘贴截图

运行结果及报错内容

我的解答思路和尝试过的方法

我想要达到的结果

import requests
import csv
url1 = 'http://category.dangdang.com/'

url2 = 'cp01.58.03.00.00.00.html'

url3 = url1 + url2
f = open('book.csv', mode='w',encoding='utf-8')
csvwriter = csv.writer(f)
resp = requests.get(url3)
obj = re.compile(r'</div>.*?单品标题" target="_blank" > (?P<name>.*?)</a>.*?target="_blank" title="(?P<chinapublisher>.*?)">.*?p">(?P<commentnum>.*?)</a></p>.*?单品出版社(?P<foreignpublisher>.*?)>', re.S)
result = obj.finditer(resp.text)
for it in result:
    print(it.group("name"))
    print(it.group("chinapublisher"))
    print(it.group("commentnum"))
    print(it.group("foreignpublisher"))
    dic = it.groupdict()
csvwriter.writerow(dic.values())
print('over!')

Answer 1

# -*- coding:utf-8 -*-

import requests
import csv,re

url1 = 'http://category.dangdang.com/'

url2 = 'cp01.58.03.00.00.00.html'

url3 = url1 + url2
f = open('book.csv', mode='w', encoding='utf-8')
csvwriter = csv.writer(f)
resp = requests.get(url3)
obj = re.compile(
    r'</div>.*?单品标题" target="_blank" > (?P<name>.*?)</a>.*?target="_blank" title="(?P<chinapublisher>.*?)">.*?p">(?P<commentnum>.*?)</a></p>.*?单品出版社(?P<foreignpublisher>.*?)>',
    re.S)
result = obj.finditer(resp.text)
print(result)

for it in result:
    # print(it)
    print(it.group("name"))
    print(it.group("chinapublisher"))
    print(it.group("commentnum"))
    print(it.group("foreignpublisher"))
    dic = it.groupdict()
    csvwriter.writerow(dic.values())              #你上面代码是这个位置问题，改成这样就好了
print('over!')