在Python3中发送电子邮件时，.csv文件更改为.txt

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

import csv

csv_file = 'data.csv'
txt_file = 'data.txt'

with open(csv_file, 'r') as file:
    reader = csv.reader(file)
    data = list(reader)

with open(txt_file, 'w') as file:
    for row in data:
        file.write(','.join(row) + '\n')

# 邮件服务器的设置
smtp_server = 'smtp.example.com'
smtp_port = 587
smtp_username = 'your_username'
smtp_password = 'your_password'

# 发件人和收件人的设置
from_email = 'sender@example.com'
to_email = 'recipient@example.com'

# 构建邮件内容
subject = 'CSV文件转换为TXT文件'
body = '附件中是转换后的TXT文件。'
attachment = txt_file

msg = MIMEMultipart()
msg['From'] = from_email
msg['To'] = to_email
msg['Subject'] = subject

msg.attach(MIMEText(body, 'plain'))

with open(attachment, 'rb') as file:
    part = MIMEText(file.read(), 'plain')
    part.add_header('Content-Disposition', f'attachment; filename="{attachment}"')
    msg.attach(part)

# 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)