[Solved] What is the issue with the following inventory update code snippet?inventory = {'eggs': 12} inventory['eggs'] -= 4 inventory['cheese'] = inventory['cheese'] + 3 | LLD

LLD - Design — Online Shopping Cart

What is the issue with the following inventory update code snippet?

inventory = {'eggs': 12}
inventory['eggs'] -= 4
inventory['cheese'] = inventory['cheese'] + 3

AUsing '+=' operator instead of '=' causes syntax error

BSubtracting from 'eggs' is invalid since quantity cannot decrease

CAccessing 'cheese' key before initialization causes a KeyError

DThe dictionary should use lists instead of integers for quantities

Step-by-Step Solution

Solution:

Step 1: Analyze the code
The code initializes 'eggs' with 12 units and decreases it by 4, which is valid.
Step 2: Identify the problem
It then tries to add 3 to 'cheese' without initializing 'cheese' in the dictionary.
Step 3: Understand Python dictionary behavior
Accessing a non-existent key like 'cheese' with '+' operator raises a KeyError.
Final Answer:
Accessing 'cheese' key before initialization causes a KeyError -> Option C
Quick Check:
Check if all keys exist before updating values [OK]

Quick Trick: Always initialize keys before updating values [OK]

Common Mistakes:

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What is the issue with the following inventory update code snippet?