Yellow: Card Games
task.add_done_callback(_done)
，这一点在safew官方下载中也有详细论述
How Co-op Live went from falling air con units to hosting the Brits
By the Renaissance, writers such as Shakespeare were talking of "star-crossed lovers", couples bound together by an overwhelming connection yet pulled apart by family, fortune or fate, as if the universe itself both wrote their love story and barred them from a happy ending.