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another discount

That‛s fantastic!
You made the change
so quickly, just in time
for the doors to open. It
does handle both kinds of
discount, right?

Both kinds of discount?

It seems that there was something that the boss forgot to tell
you. As well as deciding to cut the health club’s own prices, he
also got in touch with his old friend, the CEO of Starbuzz,
and arranged for a special discount for everyone who shows
the cashier a Starbuzz Discount Card. This is the email he
received back:

Great to hear from you!
Yes, of course, you can join the Starbuzz discount scheme! A lot of
people across the world are now working on systems for Starbuzz,
so I think I can help your coders out. Please find attached a
copy of the official Starbuzz Discount Module (tm). It's a Python
module that will calculate an additional 5% discount for every
customer who presents a Starbuzz Discount Card.
If we ever change the way the discount scheme works in the
future, we can send you an updated module and your systems
will get updated without you having to do any work at all!

Be well and keep drinking the coffee!
Your friend,
Starbuzz CEO

That’s great news. Although you’ve heard about this extra discount
late in the day, at least most of the work’s already been done for you.
You just need to use the Python module the Starbuzz CEO attached
to his email, and your program will be set up to apply both discounts.

Let’s take a look at the Starbuzz code.

204 Chapter 6