If you are starting from scratch in programming, you should start from foundations of Python programming and do not pay attention to bioinformatics aspects. I think on this stage you should just feel that you write the code more or less freely (of course everybody googling or stack overflowing, but not so often as a beginners). There are a huge amount of different courses. I, for instance, started from Courseera. In most my cases I use Python just for parsing formats of output files and creating pipelines for data processing, but it is a real magic ))) You should strive to learn to programme. I found that bioinformatics it is more experience than just learning new things in a short period of time, so the time matters. Good luck!!!