From the "About the Author" section > Marc is also one of the leads for the GNU Radio project, an open source SDR framework that is widely used in academia and

From the "About the Author" section > Marc is also one of the leads for the GNU Radio project, an open source SDR framework that is widely used in academia and defense related research. While Python is great for learning, rapid experimentation, and development, it does not lend itself well to large and computationally complex apps. GNU Radio can act as a good stepping stone for more advanced DSP apps, and a GNU Radio app or individual block is very easy to share with others.