#0228

Inventory Delta

MediumPython25 min20 XP

Problem

Given previous and current inventory dictionaries, return item deltas as current - previous for every item seen in either dictionary.

Why This Matters

Deltas are common in dashboards, sync systems, stock tracking, and audit logs.

Function Signature

def inventory_delta(previous, current):

Examples

Example 1

Inputprevious = {"apple": 5, "banana": 2}, current = {"apple": 3, "pear": 4}

Output{"apple": -2, "banana": -2, "pear": 4}

apple decreased by 2, banana disappeared, and pear is new.

Constraints

Return the exact requested value.
Handle edge cases cleanly.
Prefer readable Python before micro-optimizing.

CodePython

def inventory_delta(previous, current):
    """
    Input example: previous = {"apple": 5, "banana": 2}, current = {"apple": 3, "pear": 4}
    Return: {"apple": -2, "banana": -2, "pear": 4}
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return {}

def inventory_delta(previous, current):
    """
    Input example: previous = {"apple": 5, "banana": 2}, current = {"apple": 3, "pear": 4}
    Return: {"apple": -2, "banana": -2, "pear": 4}
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return {}

Visible browser tests run here when available.

Testcases1 visible / 3 hidden categories

Core example

Inputprevious = {"apple": 5, "banana": 2}, current = {"apple": 3, "pear": 4}

Expected{"apple": -2, "banana": -2, "pear": 4}

apple decreased by 2, banana disappeared, and pear is new.

Hidden Test Categories

same dictionariesnew items onlyremoved items only