Question

I am trying to make code that will retrieve courses, instructors and times from the input of a course number (CS101)

It should tell you the room number, instructor and time of the class after you type in the correct course number.

This is what I have so far.

def main():
    courses, instructors, times = create_info()

    print('Please enter a course number...')
    choice = input(': ').upper()

    if choice == 'CS101':
        courses.get(CS101)
        instructors.get(CS101)
        times.get(CS101)
    elif choice == 'CS102':
        print()
    elif choice == 'CS103':
        print()
    elif choice == 'NT110':
        print()
    elif choice == 'CM241':
        print()
    else:
        print('Sorry, invalid course number')
        print()
        main()

    print()
    main()



def create_info():
    courses = {'CS101':'3004', 'CS102':'4501', 'CS103':'6755', 'NT110':'1244',
               'CM241':'1411'}
    instructors = {'CS101':'Haynes', 'CS102':'Alvarado', 'CS103':'Rich',
                   'NT110':'Burke', 'CM241':'Lee'}
    times = {'CS101':'8:00 a.m.', 'CS102':'9:00 a.m.', 'CS103':'10:00 a.m.',
             'NT110':'11:00 a.m.', 'CM241':'1:00 p.m.'}

    return courses, instructors, times

main()

It gives the following:

NameError: global name ‘CS101’ is not defined

Answer 1

The problem is with these lines:

    courses.get(CS101)
    instructors.get(CS101)
    times.get(CS101)

CS101 is assumed to be a variable, and not a string or a dictionary key.

it should be something like this:

print(courses.get('CS101'))

or

print(courses['CS101'])

The key needs to be enclosed in single or double quotes to indicate it’s a string, and not a variable.