如何在Python中重新编码utf-8格式的mbox文件？

import mailbox
import codecs

mbox_file = mailbox.mbox('原始mbox文件路径')

new_mbox_file = mailbox.mbox('新的mbox文件路径', create=True)
new_mbox_file.lock()

for message in mbox_file:

content = message.get_payload(decode=True)
encoding = message.get_charset()

if encoding:
    content = content.decode(encoding).encode('utf-8')

new_message = mailbox.mboxMessage()
new_message.set_payload(content)

new_mbox_file.add(new_message)

new_mbox_file.unlock()
new_mbox_file.close()

import mailbox
import codecs

mbox_file = mailbox.mbox('原始mbox文件路径')
new_mbox_file = mailbox.mbox('新的mbox文件路径', create=True)
new_mbox_file.lock()

for message in mbox_file:
    content = message.get_payload(decode=True)
    encoding = message.get_charset()
    
    if encoding:
        content = content.decode(encoding).encode('utf-8')
    
    new_message = mailbox.mboxMessage()
    new_message.set_payload(content)
    
    new_mbox_file.add(new_message)

new_mbox_file.unlock()
new_mbox_file.close()