Python邮件程序从列表中除最后一个之外的所有主题中删除主题

# 导入所需的模块
import smtplib
from email.mime.text import MIMEText

# 定义邮件发送函数
def send_email(subject_list):
    # 邮件服务器的地址和端口
    smtp_server = 'smtp.example.com'
    smtp_port = 25

    # 发件人和收件人的邮箱地址
    sender = 'sender@example.com'
    receiver = 'receiver@example.com'

    # 邮件内容
    message = MIMEText('邮件内容', 'plain', 'utf-8')
    message['Subject'] = '邮件主题'
    message['From'] = sender
    message['To'] = receiver

    # 连接邮件服务器并发送邮件
    try:
        smtp_obj = smtplib.SMTP(smtp_server, smtp_port)
        smtp_obj.sendmail(sender, receiver, message.as_string())
        smtp_obj.quit()
        print('邮件发送成功')
    except smtplib.SMTPException as e:
        print('邮件发送失败:', str(e))

# 主题列表
subject_list = ['主题1', '主题2', '主题3', '主题4']

# 删除除最后一个之外的所有主题
if len(subject_list) > 1:
    del subject_list[:-1]

# 发送邮件
send_email(subject_list)