Inventory management in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the class representing an inventory item.

LLD

class InventoryItem:
    def __init__(self, [1], quantity):
        self.[1] = [1]
        self.quantity = quantity

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

Astock

Blocation

Citem_id

Dprice

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stock' instead of an identifier

Using 'price' which is not an identifier

Using 'location' which is unrelated here

The constructor needs an identifier for the inventory item, commonly called item_id.

2fill in blank

medium

Complete the code to add stock to the inventory item.

LLD

def add_stock(self, [1]):
    self.quantity += [1]

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

Aamount

Bitem

Cstock

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'item' which is confusing

Using 'stock' which is ambiguous

Using 'count' which is less clear

The method parameter should represent the amount of stock to add, commonly named amount.

3fill in blank

hard

Fix the error in the method to remove stock safely.

LLD

def remove_stock(self, amount):
    if self.quantity [1] amount:
        self.quantity -= amount
    else:
        raise ValueError('Not enough stock')

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

A>

B>=

C<

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' which allows removing more than available

Using '<=' which disallows removing all stock

Using '>' which disallows removing equal amount

We must check if current quantity is greater than or equal to the amount to remove.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps item IDs to quantities for items with quantity greater than 0.

LLD

stock_map = {item.[1]: item.[2] for item in inventory if item.quantity > 0}

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

Aitem_id

Bquantity

Cprice

Dlocation

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'price' or 'location' which are unrelated

Swapping keys and values

The dictionary keys should be item IDs and values should be quantities.

5fill in blank

hard

Fill all three blanks to create a method that returns a list of item IDs with quantity below a threshold.

LLD

def low_stock_items(self, [1]):
    return [item.[2] for item in self.inventory if item.quantity [3] [1]]

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

Athreshold

Bitem_id

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of '<' in the condition

Returning quantities instead of item IDs

Using wrong parameter name

The method takes a threshold and returns item IDs where quantity is less than the threshold.