How can I use the Except Exception in Python?

Question

I need to make a code that doesn't give me an error, I want a print to try again for example.

I learn in other topics, but I don't understand anything about that. I have this code:

def conversor(anosluz):
    try:
        km = float(anosluz * (9.459 * 10**12)) 
        return km
    except Exception, e:
        print 'Ooops! O valor que inseriste nao e o correcto, tenta de novo.', e


if __name__=='__main__':
    anosluz = input('Insira a distancia em anos luz: ')
    resultado = conversor(anosluz)
    print resultado

Answer 1

Divide your code into input/output and calculation:

def conversor(anosluz):
    # just convert the given anosluz into km
    km = anosluz * (9.459 * 10**12) 
    return km


if __name__=='__main__':
    while True:
        # repeat until *break*
        anosluz = raw_input('Insira a distancia em anos luz: ')
        try:
            resultado = conversor(float(anosluz))
        except ValueError, e:
            # oh, conversor raised an exception
            print 'Ooops! O valor que inseriste nao e o correcto, tenta de novo.', e
        else:
            # no exception, print result and exit
            print resultado
            break