code for computing and printing list of combinations

Tim Chase python.list at tim.thechases.com
Tue Mar 20 16:33:10 CET 2012


On 03/20/12 09:59, Joi Mond wrote:
> To All, Can someone help me with the proper code to compute
> combinations for n=7, r=5 for the following list of numbers:
> 7, 8, 10, 29, 41, 48, 55. There should be 21 combination. Also
> once there list is made can a code be written to add (sum)
> each of the set of five number in the the list. For example
> list: 8, 10, 29, 48, 55, = 150. Thanks

Sounds like you want to read up on itertools.combinations() and 
the sum() function.

http://docs.python.org/library/itertools.html#itertools.combinations

or

   >>> import itertools
   >>> help(itertools.combinations)

This sounds like a homework problem, so I won't hand you the 
answer, but you pass your list to combinations() with the 
grouping-size (r).  You then iterate over the results of that, 
and use sum() on the results.

-tkc






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