import inf120stat as stat

def choose_action():
    #returns number from 1 to 5
    print("""
ESP meny:
    1. Les inn verdier
    2. Tøm verdi listen
    3. Vis gjennomsnitt og standardavvik
    4. List ut verdiene
    5. Avslutt
Ditt valg:""")
    i = int(input())
    if i not in range(1,6): raise ValueError()
    return i

def read_values(values):
    while True:
        try:
            values.append(float(input('Ny verdi (Enter = slutt):')))
        except ValueError:
            print('Verdier kan kunn være gyldige flyttall!')
            break
    return values

def print_statistics(values):
    return(f'Antall verdier: {len(values)}, gjennomsnitt: {stat.mean(values):.2f}, standardavvik: {stat.std(values):.2f}')

def main():
    print('Starter Enkelt statistikk program (ESP)')
    values = []
    while True:
        match choose_action():
            case 1:
                # Write numbers
                read_values(values)
            case 2:
                values = []
            case 3:
                #mean, std
                try:
                    print(print_statistics(values))
                except ZeroDivisionError:
                    print('Tom liste!')
            case 4:
                print(values)
            case 5:
                exit('Hadebra :)')

if __name__ == '__main__':
    main()