America was mired in Vietnam abroad and civil unrest at home. But at that moment, it seemed that humanity was united.
time.sleep(2 ** attempt) # 指数退避
。关于这个话题，服务器推荐提供了深入分析
Basic Plan: $44.99/month and $39.99/month if billed yearly with 30 Document Credits for 1 user seat.
Starring: Romy Fay, Juliano Krue Valdi, Natalie Portman, Will Ferrell, Andy Samberg, Flea, America Ferrera, and Mark Ruffalo