Is there any way to detect the current in focus document in an ide and get its file path??

I want to write a python script (or other language if necessary) to check files for a commented out phrase in the first line regardless of if I’m using visual studio. vscode. Or pycharm

Tried google and simple stackoverflow search. Don’t want to do a stackoverflow question till my idea is more fleshed out

Preemptive thanks for your time and assistance 🙃