>>> import simplesrs as srs
>>> srs.init('srs.db')
>>> srs.Card.add('类', tags=['hanzi', 't_hanzi1'], vocabs=['人类 人類 [ren2 lei4] humanity/human race/mankind'])
>>> srs.Card.add('数学', tags=['vocab', 'pleco'])
>>> srs.Card.add('重要的事情要立即去做', tags=['sentence', 't_hanzi1'], translation='重要的事情要立即去做。 [Zhòngyào de shìqing yào lìjí qù zuò. (Also no qu (less strong))] I need to go do important things immediately.')
>>> quiz = srs.Card.iter_quiz()
>>> card = next(quiz)
>>> card
重要的事情要立即去做
>>> card.info
{
    'translation':
        '重要的事情要立即去做。 [Zhòngyào de shìqing yào lìjí qù zuò. (Also no qu (less '
        'strong))] I need to go do important things immediately.'
}
>>> card.right()  # Mark as right, and next review by now() + srs_level's timedelta()
>>> card.undo()  # Undo marking as right.
>>> card.wrong()  # Mark as wrong, and bury for default: 10 minutes.
>>> card.undo()
>>> card.bury()  # Bury for default: 4 hours