在Python中， reversed 实际上返回一个反向迭代器.因此，应用于迭代器的 list 会为您提供列出对象.

In Python, reversed actually returns a reverse iterator. So, list applied on the iterator will give you the list object.

在第一种情况下，输入也是一个列表，因此将list的结果应用于reversed迭代器似乎对您来说合适.

In the first case, input was also a list, so the result of list applied on the reversed iterator seemed appropriate to you.

在第二种情况下， str 应用于返回的迭代器对象实际上将为您提供它的字符串表示形式.

In the second case, str applied on the returned iterator object will actually give you the string representation of it.

相反，您需要迭代迭代器中的值，并使用

Instead, you need to iterate the values in the iterator and join them all with str.join function, like this

>>> ''.join(reversed('abcde'))
edcba