Libraries are what make a language.

The major feature of Python for me is that all its various open source modules for anything n-dimensional (matrices, image processing, GIS, machine learning, etc etc) all use the same data structure: the Numpy array. It's basically part of the standard library that is developed outside of it for pragmatic reasons. And with the speed of Fortran array operations.

That's something that only Matlab really has as well, but Python is much better in other aspects.