Setting and getting session data in Django - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a session in Django?

A session in Django is a way to store data on the server side for a particular user across multiple requests. It helps keep user-specific information like login status or preferences.

beginner

How do you set a session variable in a Django view?

You set a session variable by assigning a value to a key in the request.session dictionary, like request.session['key'] = value.

beginner

How do you retrieve a session variable safely in Django?

Use request.session.get('key') to get the value. It returns None if the key does not exist, avoiding errors.

intermediate

What happens if you try to access a session key that does not exist using request.session['key']?

Django raises a KeyError because the key is missing. To avoid this, use request.session.get('key').

intermediate

How can you delete a session variable in Django?

Use del request.session['key'] to remove a session variable. This deletes the key and its value from the session data.

Which of these is the correct way to set a session variable in Django?

A request.session['user'] = 'Alice'

B request.set_session('user', 'Alice')

C session['user'] = 'Alice'

D request.session.set('user', 'Alice')

In Django, session data is set by assigning a value to a key in request.session like a dictionary.

How do you safely get a session value that might not exist?

A request.session.get('key')

B request.session['key']

C request.get_session('key')

D request.session.fetch('key')

Using request.session.get('key') returns None if the key is missing, preventing errors.

What error occurs if you access a missing session key with request.session['key']?

A ValueError

B AttributeError

C TypeError

D KeyError

Accessing a missing key in a dictionary-like object raises a KeyError.

How do you delete a session variable named 'cart'?

A request.session.remove('cart')

B del request.session['cart']

C request.session['cart'] = None

D request.session.pop('cart')

Deleting a session key is done with del request.session['cart'].

Where is session data stored in Django by default?

A In server-side files

B In browser cookies

C In the database

D In local storage

By default, Django stores session data in the database, keeping it secure on the server.

Explain how to set, get, and delete session data in a Django view.

Think of request.session as a dictionary to store user data.

Describe what happens if you try to access a session key that does not exist using request.session['key'] and how to avoid errors.

Consider how dictionary access works in Python.