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modular programming

Fully Qualified Names (FQNs) prevent

your programs from getting confused

Imagine if you lived in a world where people had first names only:

Michael
Michael

Hi, it‛s Michael.
Say, are you free
on Friday night?

Lots of people share the same first name. But people also have
surnames. If you use a first name with a surname, things are a lot
less confusing.

And it’s the same thing with code. If you have two modules
containing functions with the same name, the computer will get
confused. But if you fully qualify the function name, by prefixing Oh, I need to
it with the module name, the computer will know exactly what apply the 10% discount
you mean: from promotion.py?
That‛s not a problem,
promotion.discount(1.75) since you‛re using a
FQN...

If you are going to use Fully Qualified Names (FQNs) from a
module, then you will also need to change the way you import the
code:

from promotion import *
This will import the code from promotion.py
import promotion but to use it, you will need to add “promotion."
to the start of the function name. coffee_pos.py

Now you can fix the code to use both discounts.

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