Vokabeltrainer für Arme

#!/usr/bin/python3

from random import shuffle

DE_EN = {'Vogel':'Bird', 'Baum':'Tree', 'Geschenk':'Gift'}
EN_DE = dict(x[::-1] for x in DE_EN.items())

if __name__ == '__main__':
    print('VOKABELTRAINER')

    going = True

    while going:
        print()
        lang = input('[D]eutsch oder [E]nglish: ')

        first = lang.strip().lower()[0:1]

        if first == 'd':
            vok = DE_EN
        elif first == 'e':
            vok = EN_DE
        else:
            break

        print()

        keys = list(vok.keys())
        shuffle(keys)

        good = bad = 0

        i = 0
        for k in keys:
            i += 1

            answer = input('%d von %d: %s => ' % (i, len(keys), k)).strip()

            if answer == '':
                going = False
                break
            elif answer.lower() == vok[k].lower():
                good += 1
            else:
                bad += 1
                print('Falsch: ' + vok[k])

        print('Ergebnis: %d richtig, %d falsch' % (good, bad))

    print()
    print('Ende.')