文件修改

f=open('daa','r',encoding='utf-8')
f_new=open('add.bak','w',encoding='utf-8')
for line in f:
    if '《忆秦娥·临高阁》' in  line:
       line=line.replace('《忆秦娥·临高阁》','李清照')
    f_new.write(line)
f.close()
f_new.close()