Exercise 15 of Page 190 from the book Python Programming by John Zelle.
I added my own twist by making the bars animated when opening the window.
Please note that I am a new programmer and just started on this book a few days ago only knowing basic Python.

Plots a horizontal bar chart of student exam Scores.
The Input is a file that contains the number of students on the first line.
Each subsequent line has a student's last name followed by a score in the range 1-100.

You can use the studentgrades.txt as source file or make your own.
A dialog will pop up asking you to choose your file.