I don't think there's anything in the post that you can't do in python. You can definitely get at the AST for a function using the inspect module, and similarly finding the file it's declared in and on which lines is entirely something you can get at from python.
Looking it up quickly it seems that inspect.getsourcelines[0] is just about perfect. Combining that with a slight misuse of inspect.cleandoc[1] and you've basically got the OP reproduced without even needing to resort to anything especially tricky.
[0] https://docs.python.org/3/library/inspect.html#inspect.getso...
[1] https://docs.python.org/3/library/inspect.html#inspect.clean...
