Using what you know is smart. Planning to migrate a new language "just because" I would re-think. Rewriting an entire codebase is a TON of work. I'd either just

Using what you know is smart. Planning to migrate a new language "just because" I would re-think. Rewriting an entire codebase is a TON of work. I'd either just go with PHP or go with Python. If you really do think you will need to switch languages for some reason in the future, I'd make the switch now. It'll take a little more time up front but the long term benefit will be worth it. Rewriting a codebase is something your customers can't see. It won't drive in more sales. It'll just take up time when you should be laser focused on adding features, pivoting if need be and driving bottom line growth. If you do decide to go with Python, contact me if you need help or get stuck and I'll be more than happy to give you a hand. Also, consider using Pylons. It doesn't get the press that Django does, but it's very nice and is my Python framework of choice.