Let's think about our program from the user's point of view for a moment. The first thing we want them to see when the program starts is a menu that lists all the actions they can take.

What would you like to do?
Options:
    1. List All Students
    2. View Individual Student <student_id>
    3. Add a Student
    4. Remove a Student <student_id>
    5. Quit

Let's create our menu first and then we can work down the list and implement each feature one at a time.

We'll start by putting this logic in our runner file. We can always pull it out later if need be.

Replace the lines that are printing out the staff and student variables with this code for the menu.

#runner.py
print("\nWhat would you like to do?\nOptions:\n1. List All Students\n2. View Individual Student <student_id>\n3. Add a Student\n4. Remove a Student <student_id>\n5. Quit\n")

The above code might look strange, but when we run it we'll find that our menu prints out just the way we want it to. The \n in the string tells Python to start a new line.

Right now we have a program that prints a menu and then exits. That's not very useful. We want to give the user the option to select one of the menu items. We can do that using input().

#runner.py 

mode = input("\nWhat would you like to do?\nOptions:\n1. List All Students\n2. View Individual Student <student_id>\n3. Add a Student\n4. Remove a Student <student_id>\n5. Quit\n")

print(mode)

We are going to have our user choose options by their number. If they enter 1 we'll list all students, if they enter 2 they can view a specific student's info, etc. We'll worry about error handling later.

#runner.py 
from classes.school import School 

school = School('Ridgemont High') 

mode = input("\nWhat would you like to do?\nOptions:\n1. List All Students\n2. View Individual Student <student_id>\n3. Add a Student\n4. Remove a Student <student_id>\n5. Quit\n")

if mode == '1':
    school.list_students() 
else:
    pass 

Right now if the user enters a '1' our program will run the the list_students() method on our school object. Any other input will return and exit the program. Run python3 runner.py and enter '1'. You'll get an error. What does it say?

In school.py write a method list_students that prints out a numbered list of student names followed by their school_ids. Your output should look something like this:

1. Lisa 13345
2. Jessie 12335
3. Slater 12645
4. kim 34456
5. dave 788908
6. doug 0809890

Next let's give the user the ability to see data about a single student. First, we'll update our case statement.

if mode == '1':
    school.list_students()
elif mode == '2':
    student_id = input('Enter student id:')
    student = school.find_student_by_id(student_id)
    print(str(student))
else:
    pass 

After the user chooses to view a student, they'll have to enter a student id so we have a way to look up the student. This is better than searching by name because there can be several students with the same name, but ideally each student will have a unique id.

Again if we run this and choose '2' we will get an error because we haven't written the method yet.

In school.py define a method find_student_by_id() that takes in an id and returns the student with the matching id.

When you're done you should be able to run python3 runner.py, enter '2', enter a student id, and have the student object print out in the terminal. It'll look ugly, but we'll handle that in the next release.

str() is a Python method that converts an object into a string. Some objects have a str() method defined already. For objects we make ourselves (like our student class) we can define our own str() method that to control how an object gets printed out.

Write a str() method (def __str__(self):) in the student class that prints the instance of student object in a more readable way.

LISA
---------------
age: 25
id: 13345

We've implemented two of or our features. One problem we can fix before we're done for today is the fact that our program quits out after one action. We want the user to be able to view multiple students in a session. How can we use a loop to include this functionality? Add code to runner.py so that after showing the list of students or the data from a single student, the menu displays again and the user can input another selection. Only when the user inputs a '5' should the program exit.