My wife and I will be in Paris for 10 days starting next week. We have never travelled abroad before and I am a little nervous about upsetting the locals with my camera. I've heard scare stories about tourists like myself being hassled by the local cops for taking pictures of street scenes. Is there anything to this?

If there is, what is the best strategy to get my pictures and not get hassled. If there is nothing to the stories, I'd like to hear that too.