yuan=["London","is","falling","down"] print("用fo循环和range函数方法:正向输出序列:",end=" ") #print默认end以\n回车结束,这里我们end=" ",以空格结束 for index in range(0,len(yuan)): print(yuan[index],end=" ") print() #print()这里起换行作用 print("用fo循环和range函数方法:逆向输出序列:",end=" ") for index in ___________ : print(yuan[-index],end=" ")