an element from a set

[Terry Reedy]

On 5/14/2010 11:24 AM, gerardob wrote:
>
> Hello, let S be a python set which is not empty
> (http://docs.python.org/library/sets.html)
>
> i would like to obtain one element (anyone, it doesn't matter which one) and
> assign it to a variable.
>
> How can i do this?

Depends on whether or not you want the element removed from the set

#3.1
 >>> s=set(range(10))
 >>> s
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
 >>> x=next(iter(s))
 >>> x
0
 >>> s
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9} # x not removed
 >>> x = s.pop()
 >>> x
0
 >>> s
{1, 2, 3, 4, 5, 6, 7, 8, 9} # x has been removed

The choice of 0 is an implementation artifact. It could have been any 
member.

Terry Jan Reedy