这个习题还是做得蛮顺的，唯一的疑问是在定义nextone变量时，pop从more_stuff里面取值时，取的却是从后面往前取的。不明觉厉~~
下面是用for循环改写的程序，竟然写出来了，有点小小的兴奋和成就感：）
ten_things='apple orange crows telephone light sugar'print('wait, there are not 10 things in that list. lets fix it')stuff=ten_things.split(' ')more_stuff=['day','night','song','frisbee','corn','banana','girl','boy']things=Truefor items in stuff:if len(stuff)<=9 and things: next_one=more_stuff.pop()print('adding: ', next_one)stuff.append(next_one)print(f"there'are {len(stuff)} items now")things = Trueelse:things=Falseprint('there we go: ', stuff)print("let's do some things with stuff.")print(stuff[1])print(stuff[-1])print(stuff.pop())print(' '.join(stuff))print('#'.join(stuff[3:5]))
