Enum

Python · Unit 14: Modern classes

Full plan
Python
10 exercises

Some data can only take a handful of values: the status of an order, the colour of a traffic light. With loose strings, a misspelled "pad" warns you about nothing.

An Enum gives them names. Each member has its name, the name in capitals, and its value, the data you gave it.

from enum import Enum

class Status(Enum):
    NEW = 1
    PAID = 2

s = Status.NEW
print(s)
print(s.name, s.value)

Prints

Status.NEW
NEW 1

The rest of the explanation is in the lesson, which is part of the full plan.

Exercises in this lesson

You do them in the app, which checks them on the spot and explains why.

1. Complete the code
Complete it to create the options of the traffic light.
2. Predict the output
What does this code print?
3. Predict the output
What does this code print?
4. Multiple choice
What do you gain by using an Enum instead of loose strings like "paid"?
5. Find the bug
The order is paid, so it should print Ready to ship. Which line has the error?
6. Predict the output
What does this code print?
7. Complete the code
Two adults and one child. Complete it so it prints 230.
8. Put the lines in order
Put the lines in order so it prints, in this order: GOLD 3 and then SILVER 1
9. Complete the code
Complete it to print the cost of express shipping, 120.
10. Predict the output
An Enum also works as a field of a @dataclass. What does it print?

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