Build a Grade Calculator with Classes (OOP Version)

Level: Beginner

Last week we built a grade calculator using functions (see the original project here: https://dailypythonprojects.substack.com/p/build-a-grade-calculator-with-functions). This week, we’re taking it to the next level by rebuilding the same project using Object-Oriented Programming with classes! You’ll learn how to organize your code into a class structure, making it more scalable and reusable.

Original Function-Based Script:

# Print header
print("Grade Calculator")
print("================\n")
# Function to calculate average score
# (takes a list of scores, returns the average)
def calculate_average(scores):
    average = sum(scores) / len(scores)
    return average
# Function to convert numeric score to letter grade
# (takes a score number, returns letter A-F)
def get_letter_grade(score):
    if score >= 90:
        return "A"
    elif score >= 80:
        return "B"
    elif score >= 70:
        return "C"
    elif score >= 60:
        return "D"
    else:
        return "F"
# Function to determine pass/fail status
# (takes a score, returns "PASS" or "FAIL")
def get_status(score):
    if score >= 60:
        return "PASS"
    else:
        return "FAIL"
# Function to generate the complete report
# (takes name and scores, calls other functions, prints report)
def generate_report(name, scores):
    # Calculate average using the calculate_average function
    average = calculate_average(scores)
    
    # Get letter grade using the get_letter_grade function
    letter_grade = get_letter_grade(average)
    
    # Get pass/fail status using the get_status function
    status = get_status(average)
    
    # Print the report
    print("\nStudent Grade Report")
    print("====================")
    print(f"Name: {name}\n")
    print(f"Test Scores: {', '.join(map(str, scores))}")
    print(f"Average Score: {average:.1f}")
    print(f"Letter Grade: {letter_grade}")
    print(f"Status: {status}\n")
# Get user input
# (student name)
name = input("Enter student name: ")
# Get test scores
# (comma-separated string, convert to list of integers)
scores_input = input("\nEnter test scores (comma-separated): ")
scores = [int(score.strip()) for score in scores_input.split(',')]
# Print processing message
print("\nProcessing grades...")
# Generate the report
# (call the generate_report function)
generate_report(name, scores)
# Print completion message
print("Report generated successfully!")

Project Task

Create a grade calculator using classes that:

• Uses a Student class to represent a student with name and scores

• Stores student data as class attributes

• Implements methods for calculating average, letter grade, and status

• Uses the init method to initialize student data

• Demonstrates encapsulation by keeping data and methods together

• Shows how classes create objects that maintain their own state

• Generates the same report output but with OOP structure

This project gives you hands-on practice with class creation, instance methods, the init constructor, and Object-Oriented Programming principles — essential skills for writing professional, maintainable code.

Expected Output

Here is how the script runs. The text in red is input entered by the user:

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Skeleton and Solution

Below you will find both a downloadable skeleton.py file to help you code the project with comment guides and the downloadable solution.py file containing the correct solution.

Get the code skeleton here:

Get the code solution here: