Essential tools for Python development

[Phillip B Oldham]

On Apr 22, 5:00 am, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
> [snip] and code each module so that the
> behaviour is easily introspected and tested from outside the module. If
> I'm not able to easily introspect the code at an interactive prompt,
> that's a clear sign that the code interface is poorly designed. So I fix
> that first.

Could you give a small example of this approach?