bjorney

You should look at how OPs example works first maybe

The python interpreter isn’t parsing comments, the add() function is just getting the current line number from the call stack context, and using a regex to spit out the numbers to the right of the “#” on the current executing line of the source code.

Do you stay away from C++ too? You can do this there too

https://en.cppreference.com/w/cpp/utility/source_location/line

This stuff is normally used for creating human readable error messages. E.g. printing the line of your code that actually set off the exception

The add function in the example above probably traverses the call stack to see what line of the script is currently being executed by the interpreter, then reads in that line in the original script, parses the comment, and subs in the values in the function call.

This functionality exists so when you get a traceback you can see what line of code triggered it in the error message