python爬虫写入txt文件

import requests
from lxml import etree
class Fsssezj():
    def __init__(self):
        self.header={'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36'}
        self.url='http://ewenyan.com/'
     #爬取数据
    def get_data(self):
        response=requests.get(self.url,headers=self.header)
        #解决gb2312乱码
        response.encoding='gbk'
        response=response.text
        return response
     #解析数据
    def parse_data(self,response):
        html=etree.HTML(response)
        content_text=html.xpath('//p/text()')
        return content_text
    def write(self,content_text):
        Data=''
        for i in content_text:
        #data将lxml.etree._ElementUnicodeResul转化成字符
            Data+=str(i)
            with open('shiji.txt','a',encoding='utf8') as f:
                f.write(Data)

    def run(self):
        response=self.get_data()
        content_text=self.parse_data(response)
        self.write(content_text)

if __name__=='__main__':
    Fsssezj=Fsssezj()
    Fsssezj.run()