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beginner5h

Expense Tracker

Write a Python program that records expenses, categorizes them, and reports totals — using functions, lists/dicts, and file persistence.

Tracks: Python

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Objectives

Model each expense as a data structure (dict or class)
Implement functions to add, remove, and summarize expenses
Persist expenses between runs using file I/O
Handle invalid input with exceptions instead of crashing

Before you start

Milestones

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1. Core data model

Represent expenses and implement add/list operations.

An Expense class or dict shape with amount, category, and date
A function to add a new expense to an in-memory list
A function to list all expenses

2. Summaries and validation

Add category totals and defend against bad input.

A function that totals expenses per category
Invalid amounts raise or are caught as exceptions, not silent failures
A function returns the overall total

3. Persistence

Save and reload expenses from a file.

Expenses are written to a file
Expenses can be reloaded from that file on the next run
Malformed file lines do not crash the program

References

Python docs: Reading and Writing Files