Python Exception Handling 5

Question 1

What is the correct way to define a custom exception that carries an error code?

Accepted Answer

class MyError(Exception):
  def __init__(self, msg, code):
    super().__init__(msg)
    self.code = code

Answer

Subclass `Exception`, call `super().__init__()` with the message, and store extra attributes like `code` as instance variables.

Question 2

What does `sys.exc_info()` return when called outside of an exception handler?

Accepted Answer

(None, None, None)

Answer

Outside an active exception handler, `sys.exc_info()` returns `(None, None, None)` indicating no exception is being handled.

Question 3

Which module provides `contextmanager` decorator for creating context managers that handle exceptions?

Accepted Answer

contextlib

Answer

`contextlib.contextmanager` lets you write a generator-based context manager where code before `yield` is setup and code after `yield` (with try/except) handles teardown and exceptions.

Question 4

In a `try/except/else/finally` block, what is the correct execution order when no exception is raised?

Accepted Answer

try → else → finally

Answer

When no exception occurs: `try` runs, `except` is skipped, `else` runs, then `finally` always runs last.

Question 5

What does the `__traceback__` attribute of an exception object contain?

Accepted Answer

A traceback object representing the call stack at the time of the exception

Answer

`__traceback__` holds a traceback object that can be inspected or passed to `traceback.print_tb()` to display the call stack.

Python Practice Test

Python Practice Test

Python Exception Handling 5