Error Handling and Debugging Flashcards

What happens when a `try` block raises an exception that has no matching `except` clause?

Answer: Python searches for a matching handler up the call stack

If no matching `except` clause is found in the current `try` block, Python propagates the exception up the call stack looking for a handler.

Which clause in a try/except structure always executes, whether or not an exception occurred?

Answer: finally

The `finally` clause always executes regardless of whether an exception was raised or caught.

What does the following code print? try: x = 1 / 0 except ZeroDivisionError: print('A') else: print('B') finally: print('C')

Answer: A C

The `except` block prints 'A' because a ZeroDivisionError is raised, `else` is skipped, and `finally` always prints 'C'.

Which built-in exception is raised when an operation receives the correct type but an inappropriate value?

Answer: ValueError

`ValueError` is raised when a function receives an argument of the correct type but an invalid value, such as `int('abc')`.

What is the output of this code? try: print(1) raise ValueError print(2) except ValueError: print(3) print(4)

Answer: 1 3 4

Python prints 1, then the ValueError is raised skipping print(2), the except block prints 3, and execution continues with print(4).

How do you access the exception object inside an `except` clause?

Answer: except Exception as e:

The syntax `except ExceptionType as e:` binds the exception instance to the variable `e` for use within the handler.

Which exception is raised when you try to access a dictionary key that does not exist?

Answer: KeyError

`KeyError` is raised when a dictionary is accessed with a key that is not present in it.