interesting exercise

[James Stroud]

sherry wrote:
> On May 8, 9:31 am, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> On Mon, 07 May 2007 20:45:52 -0700, Michael Tobis wrote:
>>> I have a reasonably elegant solution but it's a bit verbose (a couple
>>> dozen lines which I'll post later if there is interest). Is there some
>>> clever Pythonism I didn't spot?
>> Peering into my crystal ball, I see that your algorithm does the wrong
>> thing, and contains bugs too. You certainly don't need to partion the
>> sequence into three sub-sequences, or do that trick with the metaclass,
>> and it is more efficient to use list.extend() than sum.
>>
>> Hang on... stupid crystal ball... that's somebody else's code. Maybe you
>> should just post your code here, so we can look at it?
>>
>> In the meantime, here's a simple generator to do permutations with
>> repetition:
>>
>> def permute_with_repetitions(seq):
>>     if len(seq) <= 1:
>>         yield list(seq)
>>     else:
>>         for i, item in enumerate(seq):
>>             for tail in permute_with_repetitions(seq[:i] + seq[i+1:]):
>>                 yield [item] + tail
>>
>> It doesn't do a test for the sequence containing duplicates, and I leave
>> it as anexerciseto do selections of fewer items.
>>
>> --
>> Steven.
> 
> Dear Steven
>  I ran into your message quite accidentally while researching about
> some details on 'Exercise' and thought of sharing some of my
> findings.
> I've read at 'http://www.medical-health-care-information.com/Health-
> living/exercise/index.asp
> that Swimming, cycling, jogging, skiing, aerobic dancing, walking or
> any of dozens of other activities can help your heart. Whether it's
> included in a structured exercise program or just part of your daily
> routine, all physical activity adds up to a healthier heart.
>  I hope the above is of some help to you as well. Regards, Sherrybove.
> 

This takes annoying past annoying to some new level of hell to which 
even satan himself wouldn't venture.