Starting out with CUDA

So I'd like to learn CUDA, as a sort of challenge for myself, and as it may prove useful to me in the future, but I don't know any C or C++, and don't really plan on learning them (for now at least). Is there any way I could get started on just CUDA? I know Python and C#, so I'd be glad if there were any libraries for these languages with documentation that actualy teaches CUDA.