我不相信JavaScript解决方案还能继续工作。我在我的笔记本里写了:

    from IPython.display import display, HTML
    js = ('<script>function ConnectButton(){ '
           'console.log("Connect pushed"); '
           'document.querySelector("#connect").click()} '
           'setInterval(ConnectButton,3000);</script>')
    display(HTML(js))

当你第一次执行Run all(在JavaScript或Python代码开始之前)时，控制台显示:

Connected to
wss://colab.research.google.com/api/kernels/0e1ce105-0127-4758-90e48cf801ce01a3/channels?session_id=5d8...

然而，每次JavaScript运行时，你都会看到console.log部分，但点击部分只是给出:

Connect pushed

Uncaught TypeError: Cannot read property 'click' of null
 at ConnectButton (<anonymous>:1:92)

其他人建议按钮名称已更改为# coab -connect-button，但这也会产生相同的错误。

After the runtime is started, the button is changed to show RAM/DISK, and a drop down is presented. Clicking on the drop down creates a new <DIV class=goog menu...> that was not shown in the DOM previously, with 2 options "Connect to hosted runtime" and "Connect to local runtime". If the console window is open and showing elements, you can see this DIV appear when you click the dropdown element. Simply moving the mouse focus between the two options in the new window that appears adds additional elements to the DOM, as soon as the mouse looses focus, they are removed from the DOM completely, even without clicking.

我推荐使用jQuery(似乎collaboratory默认包含jQuery)。

function ClickConnect(){
  console.log("Working");
  $("colab-toolbar-button").click();
}
setInterval(ClickConnect, 60000);

使用Python和Selenium:

from selenium.webdriver.common.keys import Keys
from selenium import webdriver
import time

driver = webdriver.Chrome('/usr/lib/chromium-browser/chromedriver')

notebook_url = ''
driver.get(notebook_url)

# run all cells
driver.find_element_by_tag_name('body').send_keys(Keys.CONTROL + Keys.F9)
time.sleep(5)

# click to stay connected
start_time = time.time()
current_time = time.time()
max_time = 11*59*60 #12hours

while (current_time - start_time) < max_time:
    webdriver.ActionChains(driver).send_keys(Keys.ESCAPE).perform()
    driver.find_element_by_xpath('//*[@id="top-toolbar"]/colab-connect-button').click()
    time.sleep(30)
    current_time = time.time()

只需在想要运行以防止数据丢失的单元格后运行下面的代码。

!python

另外，要退出此模式，请写入

exit()

从2021年3月起，这些方法都不起作用，因为谷歌增加了一个CAPTCHA按钮，一段时间后随机弹出。

在此之前，解决方案非常简单，不需要任何JavaScript。只需要在底部创建一个新单元格，内容如下:

while True:pass

现在将单元格保持在运行序列中，这样无限循环就不会停止，从而使会话保持活动状态。

老方法:

设置JavaScript间隔，每60秒单击一次连接按钮。

用Ctrl+Shift+I打开开发者设置(在您的web浏览器中)，然后单击控制台选项卡，并在控制台提示符上键入此选项卡。(mac按Option+Command+I键)

function ConnectButton(){
  console.log("Connect pushed");
  document.querySelector("#top-toolbar > colab-connectbutton").shadowRoot.querySelector("#connect").click()
}
setInterval(ConnectButton,60000);

这一个为我工作(似乎他们改变了按钮的类名或id):

函数ClickConnect () { console.log(“工作”); document.querySelector(“colab-connect-button”).click () ｝ setInterval (ClickConnect, 60000)