如何将.docx和.doc文件从内存流附加到电子邮件？

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.application import MIMEApplication
from email import encoders

# 读取.docx和.doc文件到内存流
with open('document.docx', 'rb') as file:
    docx_data = file.read()

with open('document.doc', 'rb') as file:
    doc_data = file.read()

# 创建电子邮件对象
email = MIMEMultipart()
email['From'] = 'sender@example.com'
email['To'] = 'recipient@example.com'
email['Subject'] = 'Attached Documents'

# 添加.docx文件附件
docx_part = MIMEApplication(docx_data, Name='document.docx')
docx_part['Content-Disposition'] = 'attachment; filename="document.docx"'
email.attach(docx_part)

# 添加.doc文件附件
doc_part = MIMEApplication(doc_data, Name='document.doc')
doc_part['Content-Disposition'] = 'attachment; filename="document.doc"'
email.attach(doc_part)

# 将电子邮件对象转换为字符串
email_str = email.as_string()

# 发送邮件
smtp_server = 'smtp.example.com'
smtp_port = 587
smtp_username = 'username'
smtp_password = 'password'

with smtplib.SMTP(smtp_server, smtp_port) as server:
    server.starttls()
    server.login(smtp_username, smtp_password)
    server.sendmail(email['From'], email['To'], email_str)