Python Object-Oriented Programming Basics 3

Question 1

What is the purpose of a `@staticmethod` in Python?

Accepted Answer

It cannot access the class or instance

Answer

Static methods belong to the class namespace but receive neither `self` nor `cls`, so they cannot modify class or instance state.

Question 2

What does `isinstance(obj, MyClass)` return?

Accepted Answer

True if obj is an instance of MyClass or any of its subclasses

Answer

`isinstance()` returns `True` for the specified class and all its subclasses, supporting polymorphic checks.

Question 3

In Python, what is the Method Resolution Order (MRO)?

Accepted Answer

The order Python searches base classes when resolving a method call

Answer

MRO, computed by the C3 linearization algorithm, determines which class's method is invoked in multiple-inheritance hierarchies.

Question 4

What does the `@property` decorator do?

Accepted Answer

Allows a method to be accessed like an attribute

Answer

`@property` lets you define getter logic for an attribute so callers use `obj.name` instead of `obj.get_name()`.

Question 5

Which of the following demonstrates composition over inheritance?

Accepted Answer

class Car: def __init__(self): self.engine = Engine()

Answer

Composition means a class contains an instance of another class as an attribute, favoring 'has-a' over 'is-a' relationships.

Python Practice Test