当用户没有输入数据太慢时发送电子邮件的函数，flask sqlalchemy

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import smtplib
from email.mime.text import MIMEText

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = '数据库连接字符串'

db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(120), unique=True, nullable=False)

def send_email(to, subject, body):
    # 邮件配置
    smtp_server = 'smtp.example.com'
    smtp_port = 587
    smtp_username = 'your_username'
    smtp_password = 'your_password'

    # 构造邮件内容
    msg = MIMEText(body)
    msg['Subject'] = subject
    msg['From'] = smtp_username
    msg['To'] = to

    # 发送邮件
    with smtplib.SMTP(smtp_server, smtp_port) as server:
        server.starttls()
        server.login(smtp_username, smtp_password)
        server.send_message(msg)

@app.route('/send_email', methods=['POST'])
def send_email_route():
    email = request.form.get('email')
    if email:
        # 发送邮件
        send_email(email, 'No Data Input', 'Please input data.')
        return 'Email sent successfully.'
    else:
        return 'No email provided.'