【待解決】python寫文件時報錯：TypeError: a bytes-like object is required, not 'str'

for i in ans:
        lst = []
        lst.append(i[0].encode())
        lst.append(i[1].encode())
        print (type(lst[0]))
        writer.writerow(lst[0])

這個，現在依舊很迷啊！！！

PS C:\Users\Desktop\database> python total.py
<class 'bytes'>
Traceback (most recent call last):
  File "total.py", line 38, in <module>
    writer.writerow(lst[0])
TypeError: a bytes-like object is required, not 'str'

lst[0]就是Bytes類型啊，咋還報這個錯？路過的大佬幫幫忙啊！