stud ad python | Python Fiddle

def print_instructions():
    # Prints out the instructions 
    print "Please select an action:"
    print "1. Add a student"
    print "2. Print all students"
    print "3. Print all majors"
    print "4. Look up a student's major by name"
    print "5. Quit"
    
def get_option():
    option = int(input("Choose an option: "))
    if option != 1 and option != 2 and option != 3 and option != 4:
        print "Error. Please enter again."
        option = get_option()
    return option

def main():
    # Calls print_instructions()
    # Allows the user to interact with the database (lists)
    # Uses a while loop to allow the user to continuously use the database (lists)
    all_students = ['Ellen', 'Sam', 'Victoria', 'Rachel', 'Austin']
    all_majors = ['Information Library Science', 'English', 'Computer Science', 'History', 'Chemistry']
    print_instructions()
    option = get_option()
    while option != 5:
        if option == 1:
            student = raw_input("What is the new student's name? ")
            all_students.append(student)
            major = raw_input("What is the new student's major? ")
            if major in all_majors:
                print major, "is aleady in the list."
            all_majors.append(major)
        elif option == 2:
            for val in all_students:
                print val
        elif option == 3:
            printed_majors = []
            for val in all_majors:
                if val in printed_majors:
                else:
                    printed_majors.append(val)
            for val in printed_majors:
                print val
        else:
            lookup_name = raw_input("Please enter the name of the student: ")
            idx = 0
            length = len(all_students)
            while idx <length:
                if lookup_name == all_students[idx]:
                    break
                idx += 1
            if idx == length:
                print "Error. The name of the student does not exist."
            else:
                print "The name of the student:", lookup_name
                print "The major of the student:", all_majors[idx]
        print_instructions()
        option = get_option()
    print "Done"

main()

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