Скачать или смотреть Creating an Object in Python to Calculate Average Grades and Their Corresponding Letter Grades

Learn how to create a Python class that calculates the average of earned grades and determines the corresponding letter grade. This step-by-step guide is perfect for beginners looking to revise their coding skills.
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This video is based on the question https://stackoverflow.com/q/67574496/ asked by the user 'Jeremy Plum' ( https://stackoverflow.com/u/7619487/ ) and on the answer https://stackoverflow.com/a/67574685/ provided by the user 'Tim Roberts' ( https://stackoverflow.com/u/1883316/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

If you’ve returned to coding after a break, you might find yourself facing some old challenges, such as how to create objects, handle input, and calculate averages in Python. One common task is calculating the average of grades a student has earned and printing out the corresponding letter grade. If you've stumbled upon definitions or errors you don't understand, this guide is here to clear the fog.

Let’s take a closer look at how to efficiently create an object that takes grades as input, calculates their average, and then prints the letter equivalent of that average.

Understanding the Problem

You originally tried implementing this using a class and met some hiccups along the way. These included:

Errors related to variable definitions (specifically the grade variable).

A complex structure that made it harder to retrieve user input.

Misunderstandings regarding requiring users to input specific strings to exit a loop.

This guide will address these problems and provide you with a simplified solution that effectively uses functions instead of complex class structures.

Solution Overview

We will break down the solution into the following steps:

Define a grading function to determine the letter grade based on an average.

Create a class or function to handle input and calculation of the average grade.

Handle user input gracefully to allow an easy way for the user to exit the process.

Print the results clearly and concisely.

Step 1: Define the Grading Function

Our first step is to create a function that converts the calculated average into a letter grade. Here’s how we can do it:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

This function maps the average (scaled to [0-10]) directly to a letter grade:

F for 0% - 59%

D for 60% - 69%

C for 70% - 79%

B for 80% - 89%

A for 90% - 100%

Step 2: Create the Grade Calculator Function

Next, let's write the main function that will prompt the user for input, calculate the average, and use the grade function:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

The method ClassGrader() begins by initializing two variables for tracking the total grades earned and the total possible points.

It uses two continuous loops for getting grades earned and the total assignments.

The input is gathered until the user types "exit" (case-insensitive).

The averages are computed and printed at the end alongside the letter grade.

Conclusion

By structuring your program this way, we’ve made it far easier and more user-friendly. This approach encourages clean coding practices and adheres to Python conventions. With functions rather than classes for such a simple task, your code is simpler and more effective.

Now, you can manage grades easily, and the program provides clearer feedback to users. So the next time you need to calculate averages or grades in Python, you can apply this structured approach for better results.