Question 1 of 5
What type does type(None) report?
None is the sole instance of the NoneType type.
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Quiz
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Quick Check: Python None
Check your understanding of None, NoneType, function results, identity checks, and false values.
5 questions
~5 min
Knowledge check
Quick Check: Python None
Check your understanding of None, NoneType, function results, identity checks, and false values.
- Stuck? Each question has an optional hint.
- Skip a hard question and review it before your results.
- Questions and answer options can shuffle between attempts.
You can retake this quiz whenever you like.
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Question 2 of 5
What does a function return when it reaches the end without returning a value?
A function that ends without a return value returns None.
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Question 3 of 5
Which expression directly checks whether value is the None object?
The identity test value is None directly asks whether the object is None.
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Question 4 of 5
Which statement is correct?
None has a false truth value, but false truth value and identity with None are different ideas.
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Question 5 of 5
Why should a program distinguish None from an empty list?
None and [] are different objects and types; the program can use that difference to communicate meaning.
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Quiz results
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Review
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What type does type(None) report?Hint used
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What does a function return when it reaches the end without returning a value?Hint used
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Which expression directly checks whether value is the None object?Hint used
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Which statement is correct?Hint used
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Why should a program distinguish None from an empty list?Hint used