Day 001 of the 100 Days of Python challenge builds a command-line tip calculator. The program collects a bill total, a tip percentage, and the number of people sharing the bill, then calculates each person’s portion.
Project Overview
The program asks for three values:
- The total bill
- The tip percentage
- The number of people splitting the bill
It converts the bill to a float and the other values to int values. The tip is calculated as a percentage of the subtotal, added to the bill, and divided by the number of people.
Welcome to the tip calculator!
What was the total bill?
$120
How much tip would you like to give? $10, $12, or $15?
15
How many people to split the bill?
4
Each person should pay: $34.50
How It Works
The calculation is separated into clear steps:
tip_amount = sub_total * (tip / 100)
total_bill = sub_total + tip_amount
pay_per_person = total_bill / people
The final f-string formats the result to exactly two decimal places with :.2f, which is useful for currency output.
The script also wraps its work in main() and uses the main-module guard so the function runs when the file is executed directly.
What This Project Teaches
Day 001 provides practice with numeric data types, type conversion, percentage calculations, f-strings, and functions. It also shows why choosing the right type matters: the bill requires decimal support, while a tip percentage and people count can be whole numbers.
Running the Project
git clone https://github.com/victorhugo81/100daysofpython.git
cd 100daysofpython/day001
python main.py
View the Day 001 source code on GitHub.