At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
How are you running it?
As I recall, there are two credit card problems... one was to see how fast it would pay off with a certain payment and the other was to see what payment would be needed to pay down in a certain time frame.
Not sure I understand the question.
Before I started working on set (1) - 3 sets of credit card problems - I checked to see if the solution exists. They direct you to Lesson 4 where there is a zip folder with 3 python files. When you open any of them they prompt you with 3 questions about the details of the credit card problem, and then it runs a few numbers and shuts down. I was expecting to see the actual code there.
Don't double click on the .py file; open it using IDLE by going to File -> Open, and opening the .py solution file.