Question 1 of 5
What does x += 3 do?
It is a statement form that combines an operation and assignment.
Augmented assignment combines the operation with assignment to the target.
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Quiz
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Quick Check: Python Augmented Assignment
Check your understanding of augmented-assignment operators, target evaluation, and mutable versus immutable values.
5 questions
~5 min
Core
Knowledge check
Quick Check: Python Augmented Assignment
Check your understanding of augmented-assignment operators, target evaluation, and mutable versus immutable 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
How many times is an augmented-assignment target evaluated?
The target-once rule is one of the important differences from a written-out form.
The target is evaluated once, which matters for subscriptions and attributes with observable lookup behavior.
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Question 3 of 5
What can happen when a list is updated with +=?
Mutable objects can sometimes preserve their identity during augmented operations.
A list can perform an in-place update, so aliases to the same list can observe the mutation.
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Question 4 of 5
For a[i] += f(), which side is processed first?
Augmented assignment has a specific target-before-right-hand-side rule.
Python evaluates the augmented-assignment target first, then evaluates the right-hand expression, then performs the operation and stores the result.
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Question 5 of 5
Which statement best distinguishes := from +=?
One is an expression feature; the other is a statement feature.
The assignment-expression lesson owns :=; augmented-assignment statements use operators such as += to combine an operation with assignment.
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Quiz results
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Review
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What does x += 3 do?Hint used
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How many times is an augmented-assignment target evaluated?Hint used
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What can happen when a list is updated with +=?Hint used
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For a[i] += f(), which side is processed first?Hint used
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Which statement best distinguishes := from +=?Hint used