It will probably negatively impact your project if all of your team know PHP better and are more comfortable with it. Pick whichever language works best for your team. If some of your team love Python and are able to convince the rest of you as to why its better, then go for it. However, a bunch of strangers on HN probably aren't going to offer much of value. If you are really curious, I suggest diving into Python yourself (no play on words intended!) by reading a book on it, writing some code examples, and then maybe a small project of around 500-1000 lines, trying to use the idioms of the language that you are less familiar with. And if you're not curious, more power to you! In the end, it's the product and the team developing it that are most important.