Instructions
Sure, here's a beginner-level Python 
assignment that involves creating a 
program to manage student attendance 
at a school. This assignment assumes 
that students have unique IDs, and 
it focuses on basic input/output and 
conditional statements. 

**Assignment: Student Attendance System**

**Instructions:**

You have been tasked with creating a 
simple student attendance system for 
a school. Your program should allow 
the user to mark students as present 
or absent and then display the 
attendance status for each student.

Follow the steps below to complete
the assignment:

1. Create an empty dictionary called
`student_attendance` to store the 
attendance status of each student. 
The keys of the dictionary will 
be the student IDs (which you can
assume to be unique), and the 
values will represent the 
attendance status (either 
"Present" or "Absent").

2. Implement a function called 
`mark_attendance` that takes two 
parameters: the `student_id` and 
`status` (which can be either "P" 
for "Present" or "A" for "Absent").
The function should update the 
attendance status of the given student.

3. Implement a function called 
`display_attendance` that displays 
the attendance status of all students.
It should go through the `student_attendance`
dictionary and print out each student's ID
and attendance status.

4. In your main program, prompt the user
to perform the following actions:
   - Mark attendance for a student by 
   entering the student's ID and their
   attendance status ("P" or "A").
   - Display the attendance status of 
   all students.

5. Use a loop to allow the user to 
continuously interact with the program
until they choose to exit.

**Grading Criteria:**

- Correct implementation of the
`student_attendance` dictionary.
- Correct implementation of the 
`mark_attendance` function.
- Correct implementation of the 
`display_attendance` function.
- Proper user interface for 
marking attendance and displaying 
information.
- Correct usage of loops and 
conditional statements.
- Neat and organized code with appropriate comments.

**Sample Output:**

```
Student Attendance System

1. Mark Attendance
2. Display Attendance
3. Exit


Enter your choice: 1
Enter student ID: 101
Enter attendance status (P/A): P
Attendance marked for student 101.

Enter your choice: 1
Enter student ID: 102
Enter attendance status (P/A): A
Attendance marked for student 102.

Enter your choice: 2
Attendance:
Student ID: 101 - Status: Present
Student ID: 102 - Status: Absent

Enter your choice: 3
Goodbye!
```