Python Exception Handling 2

Question 1

What happens when an exception is raised inside a `finally` block?

Accepted Answer

It replaces any exception from the try block

Answer

An exception raised in a `finally` block replaces any exception that was propagating from the `try` or `except` block.

Question 2

Which built-in exception is raised when a key is not found in a dictionary?

Accepted Answer

KeyError

Answer

`KeyError` is raised when a dictionary lookup fails because the specified key does not exist.

Question 3

How do you re-raise the currently-handled exception without losing the original traceback?

Accepted Answer

raise

Answer

A bare `raise` statement inside an `except` block re-raises the current exception while preserving its original traceback.

Question 4

What is the output of: `print(1/0)` if wrapped with `except ZeroDivisionError as e: print(e)`?

Accepted Answer

division by zero

Answer

The `str()` representation of a `ZeroDivisionError` is 'division by zero', which is what `print(e)` outputs.

Question 5

Which clause is executed only when no exception occurs in the `try` block?

Accepted Answer

else

Answer

The `else` clause runs only if the `try` block completes without raising any exception.

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