Why learn python? Because it packs a powerful punch. Python is is easy to learn, user-friendly, highly extensible and overall a very powerful language. Like Java, it is fully object-oriented and it is as fast as C++. It allows scripting. I find that development in Python is more rapid than C++ or Java.

Python is free and fully supported by Linux, Windows and MacOS.

Who is using python? Google. Need I say more?