How much sanity checking is required for function inputs?

[Michael Selik]

On Sun, Apr 24, 2016 at 2:08 PM Steven D'Aprano <steve at pearwood.info> wrote:

> On Sun, 24 Apr 2016 04:40 pm, Michael Selik wrote:
> > I think we're giving mixed messages because we're conflating
> "constants" and globals that are expected to change.
>
> When you talk about "state", that usually means "the current state of the
> program", not constants. math.pi is not "state".
>

Perhaps I was unclear. You provided an example of what I was trying to
point out.