Esercizio Voti

massimo_punti =  [25,25,50,25,100]
assignments = ['Biologia', 'Chimica', 'Lettere','Matematica','Informatica']
students = { "Studente" : massimo_punti}

def save_grades(fileName):
    f = open(fileName + ".txt", 'w')
    keys = students.keys()
    keys.sort()
    for x in keys:
        f.write(x)
        f.write("\n")
        f.write(' '.join(map(str, students[x]))) #converte gli elementi della lista students[x] (massimo_punti) in stringhe (map str) e le unisce (' '.join())
        f.write("\n")
    f.close()

def menu():
    print "1. Aggiungi uno studente"
    print "2. Rimuovi uno studente"
    print "3. Visualizza voti"
    print "4. Registra voti"
    print "5. Visualizza menu"
    print "6. Salva voti"
    print "7. Esci"

def stampa_tutti_voti():
    print '\t'
    for i in range(len(assignments)):
        print assignments[i],'\t',
    print
    keys = students.keys()
    keys.sort()
    for x in keys:
        print x,'\t',
        grades = students[x]
        print_grades(grades)


def print_grades(grades):
    for i in range(len(grades)):
        print grades[i],'\t\t',
    print

menu()
menu_choice = 0
while menu_choice != 7:
    print
    menu_choice = input("Scegli (1-7): ")
    if menu_choice == 1:
        name = raw_input("Studente da aggiungere:")
        students[name] = [0]*len(massimo_punti)
    elif menu_choice == 2:
        name = raw_input("Studenti da rimuovere:")
        if students.has_key(name):
            del students[name]
        else:
            print "Student: ", name, " not found"
    elif menu_choice == 3:
         stampa_tutti_voti()
    elif menu_choice == 4:
        print "Registra voto"
        name = raw_input("Studente:")
        if students.has_key(name):
            grades = students[name]
            print "Digita il voto da registrare"
            print "Digita 0 per uscire"
            for i in range(len(assignments)):
                print i+1,' ',assignments[i],'\t',
            print
            print_grades(grades)
            which =1234
            while which != -1:
                which = input("cambia quale voto:")
                which = which-1
                if 0 <= which < len(grades):
                    grade = input("voto:")
                    grades[which] = grade
                elif which != -1 :
                    print "Voto non valido"
        else:
            print "Studente non trovato"
    elif menu_choice == 5:
        menu()
    elif menu_choice == 6:
        filename = raw_input("Come vuoi chiamare il file?")
        save_grades(filename)
    elif menu_choice != 7:
        break