Python 3.15 Preview: Sentinel Values Quiz
Interactive Quiz ⋅ 11 Questions
By Joseph Peart
In this quiz, you’ll test your understanding of Python 3.15 Preview: Sentinel Values.
By working through this quiz, you’ll revisit what sentinel values are, where the classic
object() idiom falls short, and how Python 3.15’s built-in sentinel type gives you
readable signatures, precise type hints, and identity that survives copying and pickling.
You’ll also practice deciding when a sentinel beats None, so you’ll know exactly which
object() markers in your own code are worth replacing once you upgrade.
The quiz contains 11 questions and there is no time limit. You’ll get 1 point for each correct answer. At the end of the quiz, you’ll receive a total score. The maximum score is 100%. Good luck!
Related Resources
Tutorial
Python 3.15 Preview: Sentinel Values
Learn how to create a Python sentinel value with the new built-in in Python 3.15 and get readable signatures, type hints, and safe copying and pickling.
