如何存储DataFrame的变量并使用它发送电子邮件？

import pandas as pd
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

data = {'Name': ['John', 'Jane', 'Mike'],
        'Age': [25, 30, 35],
        'City': ['New York', 'London', 'Paris']}
df = pd.DataFrame(data)
df.to_csv('data.csv', index=False)

df = pd.read_csv('data.csv')

sender_email = 'your_email@example.com'
receiver_email = 'recipient_email@example.com'
subject = 'DataFrame数据'
message = MIMEMultipart()
message['From'] = sender_email
message['To'] = receiver_email
message['Subject'] = subject
message.attach(MIMEText(df.to_html(), 'html'))

smtp_server = 'smtp.example.com'
smtp_port = 587
smtp_username = 'your_username'
smtp_password = 'your_password'

with smtplib.SMTP(smtp_server, smtp_port) as server:
    server.starttls()
    server.login(smtp_username, smtp_password)
    server.send_message(message)