Object-Oriented Programming Basics Flashcards
7 cards from real Python practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Object-Oriented Programming Basics flashcards as text
What does the `super()` function do in Python?
Answer: Calls a method from the parent class
`super()` returns a proxy object that delegates method calls to a parent class, enabling cooperative multiple inheritance.
Which of the following correctly defines a class method in Python?
Answer: @classmethod def method(cls):
Class methods are decorated with `@classmethod` and receive the class itself as the first argument, conventionally named `cls`.
What is the output of `type(42)` in Python?
Answer:
`type()` returns the class object of the argument, displayed as `` for integers.
Which magic method is called when an object is created?
Answer: __init__
`__init__` is called after the object is created to initialize its attributes; `__new__` allocates it but is rarely overridden.
What does name mangling do in Python (e.g., `__attr`)?
Answer: Renames the attribute to `_ClassName__attr`
Python mangles `__attr` to `_ClassName__attr` to reduce accidental override in subclasses, but it is still accessible.
What is an abstract class in Python?
Answer: A class that cannot be instantiated directly and must be subclassed
Abstract classes, created with `abc.ABC`, contain abstract methods that subclasses must implement before instantiation.
Which statement about `__str__` and `__repr__` is correct?
Answer: `__repr__` is for developers; `__str__` is for end users
`__repr__` should return an unambiguous developer-friendly string; `__str__` provides a readable user-facing string.