You should learn to use big and famous python libraries which are relevant in your field (and neighbouring fields). This could be scipy/numpy/matplotlib, pandas

You should learn to use big and famous python libraries which are relevant in your field (and neighbouring fields). This could be scipy/numpy/matplotlib, pandas, but also something regarding user interfaces, such as PyQt, or web libraries (why not learn Django, Flask), or database libraries. For the science-related libraries, there are excellent and extensive tutorials and courses in the web. I would prefer actual experience over text book knowledge. If you want to earn some money, these libraries are used by a lot of data research intensive companies; you could do some freelancing (even remote) or an internship. If you like OSS, study the source and the open tickets of the relevant libs. Enroll in the developer mailing list, if applicable. Get into touch, there will be work which you can do. Happy studying!