Random832 wrote:
> On Mon, Apr 4, 2016, at 02:56, Peter Otten wrote:
>> > That works well. Why is it 'cheating'?
>>
>> On second thought it isn't ;)
>
> It does require a numeric type, though. There are lots of types that are
> orderable but do not have a negation operator that provides a key with
> reversed ordering.
If you are willing to accept the overhead you can use a wrapper class:
>>> import functools
>>> @functools.total_ordering
... class neg:
... def __init__(self, key):
... self.key = key
... def __lt__(self, other):
... return other.key < self.key
...
>>> sorted("abcde", key=neg)
['e', 'd', 'c', 'b', 'a']
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