PYTHON PROBLEM 121 · Beginner

Update inventory: Deliveries and sales

Apply a sequence of deliveries and sales to current stock.

state update · business rulestate updatebusiness rule

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests update inventory. It belongs to the Sets and Dictionaries roadmap and uses the state update · business rule pattern.

Uniqueness, membership tests, key-value lookup, frequency counting, and grouping.

COMPLETE WORKSPACE

Learn the plan, trace the logic and run the solution

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SKILL TO CARRY FORWARD

Pattern relevance

This exercise strengthens state update · business rule. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.