[Python] Python turtle: check if a key is down

I want to be able to detect if a key is currently down.

I have found the turtle.onkey and turtle.onkeypress functions, however these don't work for me for two reasons:

1. they are only triggered when the key is pressed or released.
2. they call a function when you run them.

I want a boolean that is True if the key is held down, or False if the key is not held down.

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