文件修改

f=open('yesterday','r',encoding='utf-8')
f_new=open('yesterday2','w',encoding='utf-8')

for line in f:
    if '我从未停下脚步去思考生命的意义' in line:
        line=line.replace('我从未停下脚步去思考生命的意义','qiangql从未停下脚步去思考生命的意义')
    f_new.write(line)

f.close()
f_new.close()