Object initialization flow in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the __init__ method in a Python class?

The __init__ method is called automatically when a new object is created. It initializes the object's attributes with values.

beginner

What happens if you don't define an __init__ method in your Python class?

Python uses a default constructor that does nothing, so the object is created but no attributes are initialized automatically.

beginner

How can you pass values to initialize an object in Python?

You pass values as arguments when creating the object, and the __init__ method receives them to set the object's attributes.

intermediate

What is the order of execution when creating an object in Python?

First, memory is allocated for the new object. Then, the __new__ method runs (usually default). Next, __init__ runs to initialize the object.

intermediate

Can the __init__ method return a value?

No, __init__ must return None. It only initializes the object and does not create or return it.

What is the role of the __init__ method in Python?

A Destroy the object when it is no longer needed

B Initialize the object's attributes when it is created

C Create a new class

D Return a value from a function

The __init__ method sets up the object's initial state by initializing its attributes.

What happens if you create an object without defining __init__?

A The object is created with no initialized attributes

B Python raises an error

C The object is not created

D The object is initialized with default values automatically

Without __init__, Python creates the object but does not set any attributes automatically.

Which method is called first when creating a new object?

A <code>__init__</code>

B <code>__call__</code>

C <code>__del__</code>

D <code>__new__</code>

__new__ creates the object in memory before __init__ initializes it.

Can __init__ return a value other than None?

A No, it must return None

B It depends on the Python version

C Yes, but only integers

D Yes, it can return any value

__init__ must always return None; returning anything else causes an error.

How do you pass values to initialize an object?

A By calling a separate method after creation

B By setting global variables

C By passing arguments to the class name when creating the object

D By modifying the class directly

Arguments passed when creating the object are received by __init__ to set attributes.

Explain the flow of object initialization in Python from creation to attribute setup.

Think about what happens first and what sets the object's data.

Describe how you can customize object creation using __init__ and what happens if it is missing.

Focus on how objects get their starting values.