[colug-432] Code check

[Fandi Peng]

from itertools import combinations

print combinations( ['DVD', 'dishwasher', 'software', 'tv'],  2)
On Aug 1, 2013 1:39 PM, "Tom Hanlon" <tom at functionalmedia.com> wrote:

> Colug,
>
>
> Writing some python to do the following
>
> Take this list, or any similar list of variable length
>
> ['DVD', 'dishwasher', 'software', 'tv']
>
> And return all two item combinations.
>
> DVD *** dishwasher
> DVD *** software
> DVD *** tv
> dishwasher *** software
> dishwasher *** tv
> software *** tv
>
> My first draft looks like this.
>
> #!/usr/bin/python
> list1 = ['software', 'DVD', 'dishwasher', 'tv'];
> list1.sort();
> print list1;
> for i in range(len(list1)):
>     for i2 in range(i+1,len(list1)):
>         print list1[i], "***",list1[i2];
>
>
> It works.
>
> Can this be done in a cleaner way ?
> Am I invoking any bad habits ?
> Is there a builtin tool for this ?
>
> Reasons I am doing this..
> hive the hadoop SQL to Map Reduce translator has ngrams, that allow
> splitting strings into configurable length substrings. That is sorta cool,
> but I want all possible pairs, not just consecutive pairs.
>
> The list of items is an array to hive, I could pass an array of arrays if
> there was a complete "shuffle" I could do on the array (word list) . Not
> finding this I figure that shipping the itemlist to python would be the
> most efficient.
>
> So that is the use case, but help with the python in terms of a quick
> sanity check is what I need. Unless you happen to be doing word
> co-occurrence in hive and have some insight there.
>
> Thanks, Colug,
>
> Tom
>
>
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