LISTS: Extract every other element

[Gerrit Holl]

Randall Hopper wrote:
> I want to take a large list:
> 
>   [ 1,2,3,4,5,6,7,... ]
> 
> and build a list with every other element:
> 
>   [ 1,3,5,7,... ]

Use the filter() builtin:
>>> nums = range(10)
>>> print nums
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> def odd(i):
...     return i % 2
...
>>> filter(odd, nums)
[1, 3, 5, 7, 9]
>>> print filter.__doc__
filter(function, sequence) -> list

Return a list containing those items of sequence for which function(item)
is true.  If function is None, return a list of items that are true.

regards,
Gerrit.

-- 
"The world is beating a path to our door"

  -- Bruce Perens, (Open Sources, 1999 O'Reilly and Associates)
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