Week 3 Unit 4: Self-test

18. June 2024

Question 1

What is the purpose of a safe dictionary access?

Note: There are 3 correct answers to this question.

Safe dictionary access reduces the probability of being infected by a virus.
Safe dictionary access prevents access to keys, that do not exist.
Safe dictionary access limits the probability of wrong user input.
Safe dictionary access hides the actual access behind a condition, which checks the existence of the key.
Safe dictionary access should be used if it is not clear which keys are used to access a dictionary, for example, if the key is taken by user input.

Question 2

What is the value of variable a after the following statements have been executed?

week3 unit4 f2

key does not exist
123 : "Harry"

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