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import enum
class OrderStatus(enum.Enum):
Ready = ready
Shipped = shipped
You also have the following code to process an
Order:
def handle order(status: OrderStatus) -> None:
if status is OrderStatus.Ready:
print( ship order )
elif status is OrderStatus.Shipped:
print( charge order )
When the order is ready, you ship it; and when it s shipped, you charge it.
A few months go by and your system becomes big. So big in fact, that you can no longer ship orders immediately, and you add a new status:
import enum
class OrderStatus(enum.Enum):
Ready = ready
Scheduled = scheduled
Shipped = shipped
Before you push this change to production, you run a quick check with mypy to make sure everything is OK: ....

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