129. Python Program to Make a Class Attendance Report

Overview

Put the whole chapter together: tuples for records, sets to drop repeats, unpacking in a loop, and a dictionary to count.

Problem Statement

A teacher types who was in class: one line per student per day, a name and a day separated by a space, like Sunny Mon, until done. The same line may be typed twice by mistake; count it only once.

Print:

1. Days: and how many different days appear.
2. For every student, in A to Z order: the name and on how many of those days they were present, like Lucky: 2 of 3 days.
3. Every day: and the students present on every day, in A to Z order, joined with a comma and a space, or nobody.

For example:

Days: 3
Lucky: 2 of 3 days
Rocky: 3 of 3 days
Sunny: 3 of 3 days
Every day: Rocky, Sunny

If the first line is already done, print only:

No attendance

Use input() with no prompt text: the tests type the input for you, and a prompt would end up in your output.

Input

One line per student per day; the last line is always done. Example:

Sunny Mon
Rocky Mon
Sunny Tue
Rocky Tue
Lucky Tue
Sunny Wed
Rocky Wed
Lucky Wed
done

Output

The output for that example:

Days: 3
Lucky: 2 of 3 days
Rocky: 3 of 3 days
Sunny: 3 of 3 days
Every day: Rocky, Sunny

The tests try 4 different inputs.