关于 selenium 弹出框点击确认的问题

用 selenium 进行弹出框确认操作

def accept_alert(self):
        try:
            alert=self.driver.switch_to.alert()
            self.sleep(1)
            alert.accept()
        except NoAlertPresentException as e:

点击按钮后跳出弹出框，点击确定后页面会自动关闭

def receive_all_docs(self):
        self.click(*self.chkall_checkbox)
        self.click(*self.response_btn)//此按钮会触发弹出框
        self.accept_alert()

运行后，他会闪出弹出框，就一闪而过，然后提示以下错误：

Traceback (most recent call last):
  File "e:\Dropbox\17.Develop\5.Project\autozboa\run.py", line 21, in <module>
    manage()
  File "e:\Dropbox\17.Develop\5.Project\autozboa\run.py", line 12, in manage
    m.receive_docs()  # 接收文件
  File "e:\Dropbox\17.Develop\5.Project\autozboa\manage.py", line 57, in receive_docs
    sw.receive_all_docs()
  File "e:\Dropbox\17.Develop\5.Project\autozboa\zboa\pages\sw_page.py", line 27, in receive_all_docs
    self.click(*self.response_btn)
  File "e:\Dropbox\17.Develop\5.Project\autozboa\zboa\framework\base_page.py", line 100, in click
    log.info('元素 \' %s \' 已被点击.' % el.text)
  File "E:\Dropbox\17.Develop\5.Project\autozboa\env\lib\site-packages\selenium\webdriver\remote\webelement.py", line 76, in text
    return self._execute(Command.GET_ELEMENT_TEXT)['value']
  File "E:\Dropbox\17.Develop\5.Project\autozboa\env\lib\site-packages\selenium\webdriver\remote\webelement.py", line 633, in _execute
    return self._parent.execute(command, params)
  File "E:\Dropbox\17.Develop\5.Project\autozboa\env\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "E:\Dropbox\17.Develop\5.Project\autozboa\env\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 241, in check_response  
    raise exception_class(message, screen, stacktrace, alert_text)
selenium.common.exceptions.UnexpectedAlertPresentException: Alert Text: 确认对选中的文档执行接收操作？
Message: Modal dialog present with text: 确认对选中的文档执行接收操作？