[Tutor] How to test function using random.randint()?

[Ben Finney]

boB Stepp <robertvstepp at gmail.com> writes:

> On Sun, Mar 20, 2016 at 8:19 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> >     if rng is None:
> >         rng = random._inst
> >
> > which is the default RNG instance in the module.
>
> Can I not use:
>
> if rng is None:
>     rng = random.Random()

That will work.

It unfortunately creates a new random.Random instance every time that
line is executed, making the function waste a lot of time.

So instead, you many want to create a module-level instance, and refer
to that as the default.

    # die_roller.py

    """ Functionality for rolling numbers from polyhedral dice. """

    import random

    rng = random.Random()

    def roll_die(num_sides, rng=rng):
        # …

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Ben Finney