POC Core Python Programming Concepts 3

Question 1

What is the output of `bool([])` in Python?

Accepted Answer

False

Answer

An empty list is falsy in Python, so `bool([])` evaluates to False.

Question 2

Which statement about Python's `with` statement is correct?

Accepted Answer

It automatically calls __enter__ and __exit__ on a context manager

Answer

The `with` statement invokes `__enter__` at the start and guarantees `__exit__` is called when the block ends, even if an exception occurs.

Question 3

What is the result of `'hello'[1:4]`?

Accepted Answer

'ell'

Answer

Slice notation [1:4] returns characters at indices 1, 2, and 3, which are 'e', 'l', 'l' → 'ell'.

Question 4

Which built-in function returns an iterator of (index, value) pairs?

Accepted Answer

enumerate()

Answer

`enumerate()` wraps an iterable and yields (index, value) tuples for each element.

Question 5

What happens when you raise an exception without an argument inside an `except` block?

Accepted Answer

The caught exception is re-raised

Answer

A bare `raise` inside an `except` block re-raises the currently handled exception with its original traceback.

(POC) Python Online Certification Practice Test