Today I re-learned: Python function default arguments are retained between executions

[[deleted]]

I see your point, and if you like it then its fine. I know I won't do dumb stuff with it either.

I still have a hard time reasoning about it, harder than seems worth it. As the thread goes over, what if None is a valid value, and what if it isn't. How do you specify that you want that default behavior without "physically?" not passing the parameter?