50% water change

Pythons, are they actually worth it? I have a 200L tank and I want to start doing 50% water changes each week. It takes about an hour with a jug and a large bucket, how much faster would it be if I was using a python? I read some of the reviews online and most of them are good, but they all say...

Hello! I’m going to be doing a 50% water change and I was wondering can u pour the new water with the fish in the tank or will it stress it out?