请优化这段代码 def emails(mimetext) -> None: """发送邮件的方法；minetext：邮件内容，类型：str""" if yml()['email']['switch']: logging.info('进入【邮件告警】的方法') try: mailserver = yml()['email']['email_information']['mailserver'] username_send = yml()['email']['email_information']['username_send'] password = yml()['email']['email_information']['password'] for user in yml()['email']['email_information']['username_to']: username_recv = user mail = MIMEText("{}".format(mimetext)) mail['Subject'] = yml()['email']['email_text']['start']['mail_head'] mail['From'] = username_send mail['To'] = username_recv smtp = smtplib.SMTP(mailserver, port=yml()['email']['email_information']['port']) smtp.login(username_send, password) smtp.sendmail(username_send, username_recv, mail.as_string()) smtp.quit() except Exception as E: logging.error("执行【邮件告警】报错%s\n%s" % (E, traceback.format_exc())) else: logging.warning('未启用【邮件告警】！')

可以考虑以下优化：

1. 将配置信息的读取提取到函数外部，避免在函数内多次读取，影响性能。

2. 使用 with 语句来管理 SMTP 连接，可以自动管理连接的关闭，避免遗漏。

3. 使用 f-string 格式化字符串，代码更加简洁易读。

4. 将异常捕获细分，针对不同的异常类型进行不同的处理。

优化后的代码如下：

def load_email_config():
    email_config = yml()['email']['email_information']
    return email_config['mailserver'], email_config['username_send'], email_config['password'], \
           email_config['port'], email_config['username_to']


def send_email(mimetext):
    """发送邮件的方法；minetext：邮件内容，类型：str"""
    if yml()['email']['switch']:
        logging.info('进入【邮件告警】的方法')
        try:
            mailserver, username_send, password, port, username_to = load_email_config()
            for user in username_to:
                username_recv = user
                mail = MIMEText(f"{mimetext}")
                mail['Subject'] = yml()['email']['email_text']['start']['mail_head']
                mail['From'] = username_send
                mail['To'] = username_recv
                with smtplib.SMTP(mailserver, port=port) as smtp:
                    smtp.login(username_send, password)
                    smtp.sendmail(username_send, username_recv, mail.as_string())
            logging.info('邮件发送成功')
        except smtplib.SMTPAuthenticationError:
            logging.error('邮件发送失败：SMTP认证错误')
        except smtplib.SMTPConnectError:
            logging.error('邮件发送失败：SMTP连接错误')
        except Exception as e:
            logging.error(f'邮件发送失败：{e}')
    else:
        logging.warning('未启用【邮件告警】！')