Try and Throw

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Which term describes a run-time error that can be caught instead of stopping the program?: Exception
What is meant by 'try' in Python?: A block of code that is run and may cause an error
In Python, which keyword is used to signal that an error has occurred?: Raise
What is meant by 'throw' in languages such as Java and JavaScript?: To signal that an exception has occurred
Which term describes the action of dealing with an exception so that the program does not crash?: Catch
In Python, which keyword starts the block of code that runs when an error is caught?: Except
A program asks for an age, the user enters -5, and the program stores it and prints a result. What does this show?: Invalid input was used and the program gave a wrong result
A program runs int(input()) to read a whole number and the user types the word hello. What happens in Python?: The program stops with a ValueError
What is the purpose of a try and except block in Python?: To catch a run-time error so the program does not crash
When an error happens inside a try block, what happens to the statements in that block that have not yet run?: They are skipped and the except block runs instead
In Python, what does except ValueError catch?: Only errors from text that is not a whole number
A programmer catches ValueError around int(input()) but adds no range check. The user enters 500 as an age. What happens?: 500 is accepted because it is a whole number
What is the usual way for a program to deal with invalid input from a user?: Check the input before using it and ask again until it is valid
A try and except block sits inside a loop that repeats until the input is a whole number. The user enters ten, then 15. What happens?: A message appears once, then the age 15 is accepted
A while loop keeps asking for an age until valid is True. Why does the line valid = True run after the input has been converted?: So the loop stops once the input has converted
The code inside a try block runs without any error. What happens to the except block below it?: It is skipped and the program carries on
A program uses a while loop with a range check to accept an age between 0 and 120. The user enters 150, then -3, then 15. What is shown?: The message twice, then the age is accepted

Try and Throw

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