# Billing Summary Analyzer – Python Demo Script

## What It Does
This script reads a simple billing data file (`example.txt`) and:
- Counts total invoices
- Calculates total billed amount
- Computes the average invoice value
- Groups totals and counts by client
- Prints a clear summary to the terminal

## What It Demonstrates
This example is meant to show clear, practical Python fundamentals that apply across many roles:
- Reading and parsing structured text files
- Converting and validating numeric data
- Grouping and summarizing information
- Using standard library tools like `collections`
- Writing readable, maintainable functions

## How to Run It
1. Make sure Python is installed
2. Save `billing_analyzer.py` and `example.txt` in the same folder
3. Open a terminal in that folder and run:
   python billing_analyzer.py
