Python's written elegantly and has a simple syntax and framework. Whereas PHP is used strictly for web application development. Python uses indentation over curly braces, whereas PHP uses curly braces and semi-colon to end each statement of the code.
If you are looking forward to building responsive webpages, I would still recommend you to choose Python 3. Modules like Web2Py extend rich support to Python and allow responsive web pages to be developed using Python.
Python also has significant frameworks like Django, Flask, Web2Py, Pylon - package manager - pip whereas PHP uses Laravel, Symfony, Slim, Codeignitor