def main_menu():
school = School.create_from_csv('school.csv')
user_choice = None
while user_choice != 0:
view.print_main_menu()
user_choice = view.get_user_input()
if user_choice == 1:
view.get_list(school.get_all_teachers())
elif user_choice == 2:
print(school.get_best_class())
elif user_choice == 3:
choose_class(school)
elif user_choice == 4:
new_class = add_class(school)
class_controller.class_menu(new_class)
elif user_choice == 5:
school.save_to_file()
view.print_exit_message()
