Inventory management in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main component responsible for tracking stock levels.

HLD

class InventoryManager:
    def __init__(self):
        self.stock = [1]

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

A[]

Bset()

CNone

D{}

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list instead of a dictionary for stock storage.

Initializing stock as None which causes errors when updating.

The stock should be stored in a dictionary to map item IDs to their quantities.

2fill in blank

medium

Complete the code to add a new item with quantity to the inventory.

HLD

def add_item(self, item_id, quantity):
    if item_id in self.stock:
        self.stock[item_id] [1] quantity
    else:
        self.stock[item_id] = quantity

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

A+=

B-=

C*=

D/=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-=' which would decrease stock incorrectly.

Using '*=' or '/=' which are not appropriate for addition.

When the item already exists, increase its quantity by the new amount using '+='.

3fill in blank

hard

Fix the error in the code to correctly check if an item is available in stock.

HLD

def is_available(self, item_id):
    return self.stock.get(item_id, 0) [1] 0

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

A==

B<=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which only checks for exact zero.

Using '<=' or '<' which check for zero or less.

To check availability, the quantity must be greater than zero.

4fill in blank

hard

Fill both blanks to implement a method that removes a quantity of an item safely.

HLD

def remove_item(self, item_id, quantity):
    if self.stock.get(item_id, 0) [1] quantity:
        self.stock[item_id] [2] quantity
        return True
    return False

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

A>=

B<

C-=

D+=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' to check stock which is incorrect logic.

Using '+=' to remove stock which increases it.

Check if stock is enough with '>=' and then subtract quantity with '-='.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that lists items with low stock.

HLD

threshold = {{BLANK_3}}
low_stock = {item: qty for item, qty in self.stock.items() if qty [1] threshold}

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

A<

B10

C<=

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>=' or '>' which finds high stock instead.

Confusing threshold values or operators.

Use '<' to find items with quantity less than threshold, set threshold to 5 or 10 as needed.