Shopping cart and session management in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the unique session for a user.

HLD

session_id = request.cookies.get([1])

Drag options to blanks, or click blank then click option'

Acart_id

Buser_id

Csession_id

Dtoken

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user_id' instead of 'session_id' as cookie name.

Confusing 'cart_id' with session identifier.

The session ID is stored in the cookie named 'session_id' to track the user's session uniquely.

2fill in blank

medium

Complete the code to add an item to the shopping cart stored in session.

HLD

session['cart'].[1](item_id)

Drag options to blanks, or click blank then click option'

Aappend

Bremove

Cclear

Dpop

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'remove' which deletes an item instead of adding.

Using 'pop' which removes the last item.

To add an item to the cart list in session, use the 'append' method.

3fill in blank

hard

Fix the error in the code to retrieve the cart items safely from session.

HLD

cart_items = session.get([1], [])

Drag options to blanks, or click blank then click option'

Acart

Bsession_id

Cuser_id

Ditems

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user_id' or 'session_id' which are unrelated keys for cart items.

Using 'items' which is not the standard key.

The shopping cart is stored under the key 'cart' in the session dictionary.

4fill in blank

hard

Fill both blanks to create a dictionary of item counts in the cart.

HLD

item_counts = {item: cart.count([1]) for item in set(cart) if cart.count(item) [2] 1}

Drag options to blanks, or click blank then click option'

Aitem

B>

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators like '==' or '<' instead of '>'.

Passing wrong argument to count method.

The dictionary comprehension counts each unique item in the cart if its count is greater than 1.

5fill in blank

hard

Fill all three blanks to update the session cart and set cookie expiration.

HLD

session[[1]] = updated_cart
response.set_cookie([2], session[[3]], max_age=3600)

Drag options to blanks, or click blank then click option'

A'cart'

B'session_id'

D'user_id'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user_id' as cookie name instead of 'session_id'.

Mixing keys between session and cookie.

The cart is stored in session under 'cart'. The cookie named 'session_id' is set with the session cart value and expiration.