tag = True while tag:print("level")choice = input("level>>>").strip() #作用是暂停 不会一直死循环if choice == "quit":break #终止当前循环进入到上一层if choice == "quit_all": tag = False #不用一层层退出 直接退出整个循环while tag:print("level2")choice = input("leve2>>>").strip()if choice == "quit": breakif choice == "quit_all": tag = Falsewhile tag:choice = input("leve3>>>").strip()if choice == "quit": breakif choice == "quit_all": tag = False
