How do you press two keys at the same time with Python Selenium?

Question

Trying to do accessibility automation and want to use shift+tab to go back an element. But can't seem to get anything to work. Tried what the doc imply should work based off their "Example, pressing ctrl+c:":

action = ActionChains(driver)
action.key_down(Keys.SHIFT)
action.send_keys(Keys.TAB)
action.key_up(Keys.SHIFT)
action.perform();

Then I guessed at :

action = ActionChains(driver)
action.key_down(Keys.SHIFT).key_down(Keys.TAB)
action.key_up(Keys.SHIFT).key_up(Keys.TAB)
action.perform();

And:

action = ActionChains(driver)
action.key_down(Keys.SHIFT)
action.key_down(Keys.TAB)
action.perform();
action = ActionChains(driver)
action.key_up(Keys.SHIFT)
action.key_up(Keys.TAB)
action.perform();

And:

action = ActionChains(driver)
action.send_keys(Keys.TAB + Keys.SHIFT).perform();

And:

ActionChains(driver).send_keys(Keys.TAB).perform() # Tabs 1 forward
time.sleep(1)
ActionChains(driver).send_keys(Keys.SHIFT, Keys.TAB).perform() # Tabs 1 backwards
time.sleep(1)
ActionChains(driver).send_keys(Keys.SHIFT, Keys.TAB).perform() # Tabs 1 forward
time.sleep(1)

But none of them work. At least at selenium 3.14 & chrome 71.

---

So how do I hit shift and tab at the same time in Python Webdriver?

UPDATE: The correct answer, answered the summary question of two keys at the same time. But my specific example, I had tried the correct way to send them but it was working intermittently. This is because unbeknownst to me it was treating the shift key as a press down and not release. So the second time I would try it, it was release shift (and thus not tab backwards every other time). So specially for shift and tab you need to do this to press, shift, tab, then release shift.

# At time of writing this didn't work, but now seems to.
action = ActionChains(context.driver)
action.key_down(Keys.SHIFT)
action.send_keys(Keys.TAB)
action.key_up(Keys.SHIFT)
action.perform()

# Chrome was only taking this at time of writing question.
ActionChains(driver).send_keys(Keys.SHIFT, Keys.TAB, Keys.SHIFT).perform()

Answer 1

That's the signature for send_keys:

send_keys(*keys_to_send)

The asterisk means it expects a variable number of arguments. So, you should do something like:

send_keys(Keys.ALT, Keys.TAB)

Or maybe a combination of key_down and key_up.

Answer 2

I can't get this to work on my end either. Digging around, I found a Stack Overflow answer that points to this Chromium bug, which says:

This is a limitation in the way we simulate keyboard input in ChromeDriver. Keys get sent directly to the render process, bypassing the browser process. So any keyboard shortcut handlers in the browser process will not be invoked by sendKeys().

Possibly this problem also applies to ActionChains. Please let us know if you do figure out a way!