Python爬取文本写入CSV，用replace替换br标签后，每个字后面都会换行？

代码：

# -*- coding:UTF-8 -*-
from bs4 import BeautifulSoup
import requests
import csv
if __name__ == "__main__":
     target = 'http://www.biqukan.com/1_1094/5403177.html'
     req = requests.get(url = target)
     html = req.text
     bf = BeautifulSoup(html,'html.parser')
     texts = bf.find_all('div', {'id': 'content'})
     final=texts[0].text.replace('<br/>','')

     with open('ex.csv', 'a',errors='ignore', newline='') as f:
         f_csv = csv.writer(f)
         f_csv.writerows(final)

未使用replace：

使用replace：

为什么呢 拜托啦

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# -*- coding:UTF-8 -*-
from bs4 import BeautifulSoup
import requests

if __name__ == "__main__":
     target = 'http://www.biqukan.com/1_1094/5403177.html'
     req = requests.get(url = target)
     html = req.text
     print(html)
     bf = BeautifulSoup(html,'html.parser')
     texts = bf.find_all('div', {'id': 'content'})
     print(texts[0].text)
     final=texts[0].text.replace('<br/>','')
     print(final)

     with open('ex.csv', 'w+',errors='ignore', newline='') as f:
         f.write(final)
         f.close()

不需要用CSV这个库