Python Python 4

Question 1

What is the difference between `@staticmethod` and `@classmethod` in Python?

Accepted Answer

@classmethod receives the class as first arg, @staticmethod receives no implicit arg

Answer

`@classmethod` receives the class (`cls`) as its first argument, while `@staticmethod` receives no implicit first argument.

Question 2

What will `[x**2 for x in range(5) if x % 2 == 0]` evaluate to?

Accepted Answer

[0, 4, 16]

Answer

The comprehension squares only even numbers from 0–4: 0²=0, 2²=4, 4²=16.

Question 3

Which module provides support for regular expressions in Python?

Accepted Answer

re

Answer

The built-in `re` module provides functions like `re.search()`, `re.match()`, and `re.sub()` for working with regular expressions.

Question 4

What happens when you use `open('file.txt', 'a')` mode?

Accepted Answer

Opens for appending; writes go to end without erasing existing content

Answer

Mode `'a'` opens a file for appending, creating it if it doesn't exist, and all writes go to the end.

Question 5

What does `enumerate()` return when iterating over a list?

Accepted Answer

Tuples of (index, value)

Answer

`enumerate()` yields `(index, element)` tuples, letting you track both position and value in a loop.

Python Practice Test