set function

[Kam-Hung Soh]

On Sat, 17 May 2008 15:49:05 +1000, Beema shafreen  
<beema.shafreen at gmail.com> wrote:

> Hi all,
> I need to find the intersection of 10 different files with ids defined as
> a_items, b_items and so on
>
> common_items = a_items&b_items&c_items&\
>                d_items&e_items&f_items\
>                &g_items&h_items&i_items&j_items
>
> i have included above line in the script
> is this an right way will my program accept it or what are the other  
> option
> to compare 10 different such items

See "Set Types", http://docs.python.org/lib/types-set.html.  Example:

s1 = set([1,2,3])
s2 = set([3,4,5])
s1 & s2
set([3])

You can populate your sets using an iterable, such as the lines from a  
file.  Example:

s1 = set(file(r'blah.txt'))

-- 
Kam-Hung Soh <a href="http://kamhungsoh.com/blog">Software Salariman</a>