[Zope] How to get 4 Random DTML Documents

[Dennis Allison]

The O'Reilly Python Cookbook gives a couple of interesting approaches--

2.8 Selecting random elements from a list without repetition
4.5 Retrieving a line at randome from a file of unknown size

On 8 Nov 2003, Dylan Reinhardt wrote:

> On Sat, 2003-11-08 at 11:12, Martin Koekenberg wrote:
> > Hello,
> > 
> > That is a solution but  that gives me 4 random links an not set of 4 random
> > links without double entry's.
> 
> Ah... that's a different question.  :-)
> 
> For this, I'd ditch DTML and move to Python Scripts.
> 
> I'd use two scripts, one to generate random links and one that ensures
> that you have exactly four non-duplicating ones.  I suppose you could
> also do this recursively, but I try to avoid being tricky with Python
> Scripts.  :-)
> 
> Doing this, your controller script will look something like:
> 
> -----
> my_pages = {}
> while 1:
>     rnd_page = context.other_script()
>     if not my_pages.has_key(rnd_page):
>         my_pages[rnd_page] = 1
>     if len(my_pages) > 3:
>         break
> return my_pages.keys()
> -----
> 
> The above is totally untested, but should be close enough to move you
> forward.
> 
> HTH,
> 
> Dylan
> 
> 
> 
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