How does 'warnings.py' work with the rest of the code? Intrigued as I've put myself into a corner with the way warnings/errors are handled in my project. By th

How does 'warnings.py' work with the rest of the code? Intrigued as I've put myself into a corner with the way warnings/errors are handled in my project. By the way I think there is a convention to handle these issues but it appears numpy isn't using it. If I remember correctly, any module with __ infront will be called {package}.__{module}.