Just asking, I know nothing about Python. What is it good for? What advantages/disadvantages does it have to make downloadable stuff or browser stuff with other languages like Java and JS?
I use Python for most of my on-to-go scripting because it looks cleaner and more readable than the other scripting languages I know. Plus, its standard library (containing built-in functions) is huge, and there are a multitude of libraries which collectively cover pretty much any venture you want to do.
However, Python isn't strictly necessary to learn for web development, as Javascript can do (or at least simulate) everything Python can, with things like Node.js.