Cancellation and refund policy in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the cancellation status in the policy class.

LLD

class CancellationPolicy:
    def __init__(self):
        self.status = '[1]'

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

Aactive

Bcancelled

Cpending

Drefunded

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'cancelled' as initial status which means policy is inactive.

The cancellation policy starts with an 'active' status indicating it is valid.

2fill in blank

medium

Complete the method to check if a refund is allowed based on the policy status.

LLD

def can_refund(self):
    return self.status == '[1]'

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

Aactive

Bexpired

Ccancelled

Drefunded

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'active' which means policy is still valid.

Refunds are allowed only if the policy status is 'cancelled'.

3fill in blank

hard

Fix the error in the refund calculation method to correctly compute refund amount.

LLD

def calculate_refund(self, amount):
    if self.status == 'cancelled':
        return amount [1] 0.8
    else:
        return 0

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' or '-' which changes the amount incorrectly.

The refund is 80% of the amount, so multiplication by 0.8 is correct.

4fill in blank

hard

Fill both blanks to complete the policy update method that sets status and logs the change.

LLD

def update_policy(self, new_status):
    self.status = [1]
    print('Policy status changed to', [2])

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

Anew_status

B'new_status'

Cself.status

D'self.status'

Attempts:

3 left

💡 Hint

Common Mistakes

Using string literals instead of variables.

The status is updated to the variable new_status, and the current status is printed.

5fill in blank

hard

Fill all three blanks to complete the refund eligibility check with time and status conditions.

LLD

def is_refund_eligible(self, days_since_purchase):
    return self.status == [1] and days_since_purchase [2] [3]

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

A'cancelled'

B<=

C30

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators or status strings.

Refund is eligible if status is 'cancelled' and purchase was within 30 days.