摘要:
flag = False while not flag: for i in third_menu: print(i) choice1 = input("请选择一级菜单:") if choice1 in third_menu: while not flag: for i in third_menu[c 阅读全文
摘要:
可能有点绕 1.node.next –> node.pre;node.pre –> node.next(递归)2.head.next –> None;tail.pre –> None3.head–>tail;tail–>head 阅读全文