用python写一段代码，flask的blueprint 异步发送带附件的邮件

以下是使用 Python 和 Flask 的 Blueprint 异步发送带附件的邮件的代码示例：

from flask import Blueprint, current_app, jsonify, request
from flask_mail import Message, Mail
import threading

mail_bp = Blueprint('mail', __name__)
mail = Mail()

def send_async_email(app, msg):
    with app.app_context():
        mail.send(msg)

@mail_bp.route('/send_mail', methods=['POST'])
def send_mail():
    data = request.get_json()
    recipient = data.get('recipient')
    subject = data.get('subject')
    body = data.get('body')
    attachment = data.get('attachment')

    msg = Message(subject=subject, recipients=[recipient])
    msg.body = body

    with current_app.open_resource(attachment) as f:
        msg.attach(attachment, 'application/octet-stream', f.read())

    thread = threading.Thread(target=send_async_email, args=(current_app._get_current_object(), msg))
    thread.start()

    return jsonify({'message': 'Email sent successfully.'}), 200

请注意，此代码示例仅供参考。在实际使用中，您需要根据您的具体需求进行修改和调整。