Object lifecycle overview in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the object lifecycle in Python?

The object lifecycle is the process an object goes through from creation, usage, and finally to destruction when it is no longer needed.

beginner

How is an object created in Python?

An object is created when a class is called like a function, which runs the <code>__new__</code> method to create the object and then the <code>__init__</code> method to initialize it.

beginner

What happens during the usage phase of an object?

During usage, the object’s methods and properties are accessed and modified as needed by the program.

intermediate

How does Python destroy an object?

Python destroys an object when its reference count drops to zero, triggering the __del__ method and freeing memory.

intermediate

What is the role of __del__ method in the object lifecycle?

The __del__ method is called when an object is about to be destroyed, allowing cleanup actions before memory is freed.

Which method is called when a new object is created in Python?

A __init__

B __del__

C __str__

D __call__

The __init__ method initializes a new object when it is created.

When does Python destroy an object?

A Immediately after creation

B When its reference count reaches zero

C When the program starts

D When __init__ is called

Python destroys objects when no references to them remain.

What is the purpose of the __del__ method?

A To clean up before the object is destroyed

B To initialize the object

C To print the object

D To copy the object

The __del__ method allows cleanup actions before the object is removed.

Which phase comes after object creation in the lifecycle?

A Destruction

B Initialization

C Garbage collection

D Usage

After creation, the object is used by the program.

What triggers the object destruction process?

A Calling __init__

B Calling __str__

C Reference count dropping to zero

D Assigning a new value

When no references remain, Python destroys the object.

Describe the main stages of an object's lifecycle in Python.

Think about what happens from when you make an object to when it disappears.

Explain how Python knows when to destroy an object.

Consider how Python tracks if an object is still needed.