short-circuiting any/all ?

Tim Wintle tim.wintle at
Mon Mar 22 16:12:52 CET 2010

On Mon, 2010-03-22 at 14:45 +0000, kj wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L,

any( is_invalid(a) for a in L )

... generator expression will be lazily computed.


More information about the Python-list mailing list