Python3:发送包含二进制数据的电子邮件？

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.text import MIMEText
from email.utils import COMMASPACE
from email import encoders

# 邮件发送者和接收者的邮箱地址
sender_email = "sender@example.com"
receiver_email = "receiver@example.com"

# 初始化MIMEMultipart对象
message = MIMEMultipart()

# 设置邮件发送者和接收者
message["From"] = sender_email
message["To"] = receiver_email

# 设置邮件主题和正文
message["Subject"] = "包含二进制数据的电子邮件"
message.attach(MIMEText("这是一个包含二进制数据的电子邮件", "plain"))

# 添加二进制数据
binary_data = b"这是二进制数据"
attachment = MIMEBase("application", "octet-stream")
attachment.set_payload(binary_data)
encoders.encode_base64(attachment)
attachment.add_header("Content-Disposition", "attachment", filename="binary_data.bin")
message.attach(attachment)

# 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(sender_email, receiver_email, message.as_string())