How do I get rid of fruit flies?

[BlackDog]

We've had some here this summer. I've used a short juice glass with a piece of banana in it, cover the top with plastic wrap, and poke a couple holes with a pencil in the plastic wrap. They get in the glass but not out. Once a day I'd cover the top with my hand, take it outside, and open the plastic wrap. Seemed to work pretty well.