[Python] Capturing a screenshot and saving to a document with a Python background script

I’m doing some testing activity which requires me to capture a screenshot of applications, database systems, etc. and save it to a document.

The whole activity has more than 50 screenshots. Is there a way in Python through which I can take a screenshot with a Windows shortcut key (for example, Ctrl + Alt + Shift + C) and it appends the image to a document file?

I believe the Python program should be running in the background, like nohup in Unix.

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