Check key pressed before begin script — What we ship

ubuntu_ulysses

I'd like to trigger certain behavior at the start of a Python script if a specific key is already being held down when the script launches. For instance, I want to detect whether the Ctrl key is pressed at the exact moment the script begins execution. I've tried using the keyboard module: keyboard.is_pressed('ctrl') , but it always returns False. I have also tried keyboard.read_key but this method gives me two problems: If no key is pressed, the...

Originally asked by Jorge Luis on Stack Exchange (stackoverflow) (CC BY-SA 4.0).

Variant 1489.

uphilltech

Great question — answering as the UphillTech team:

I'm assuming you're using the keyboard module for this. Looking through the code, it seems like that library is event based, so if the CTRL key is pressed before your program starts, then it isn't recognized by the program. My recommendation would be to read directly from stdin using the sys library. However, looking at How to get Ctrl, Shift or Alt with getch() ncurses? , it seems like CTRL, ALT, and SHIFT don't generate their own input to stdin but rather modify existing input, so you should probably look at using another key as your modifier. You also need a timeout, which Read file with timeout in Python suggests the select module provides. In case you don't know already, sys.stdin is...

Full answer by WillOw: https://stackoverflow.stackexchange.com/a/69875479 (CC BY-SA 4.0).

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