Please use python to explain and make as many comments as you can to help me better understand the problem. Thanks in advance for the help! The Albright, Baker, and Coleman families are running their...

Please use python to explain and make as many comments as you can to help me better understand the problem. Thanks in advance for the help!

The Albright, Baker, and Coleman families are running their annual garage sale. Write a program that pulls totals from a file and displays that total. The program prompts the user for a letter (a, b, c, which can be capital or lower case), then item name, and cost. The program should keep a running total for each family. If Z is entered for the family name, the sales for each family totals are displayed, along with a grand total. It should also show the difference between current year and previous year gross total.

A file for each family is created that contains the items sold, cost and totals. Just create a random .txt file as needed please ^^;