Key Ideas

• A csv (comma-separated values) file is a common file format.
• The file grades.csv is an example of a csv file that might be used to keep track of grades in The Joy and Beauty of Data.
• Creating a new file from an existing file is a common task for a computer scientist.

Active Learning

• Write a Python program that creates a file named grades2.csv. The new file should contain all of the information from grades.csv In addition, there should be a fourth column entitled Average. For each student, the value in the new column should be the average of the two grades.