Python offers many useful tools for preparing data and controlling synthesis processes. Although it can also be used for actual digital signal processing, its versatility makes it a great tool for auxuliary tasks. Most notably, it can be used for flexible processing and routing of OSC messages, especially in the field of data sonification.
Python & OSC
A large variety of Python packages offers the possibility of using OSC. They can be installed using pip:
$ pip install python-osc $ pip install pythonosc
An example project for controlling a Faust-built synthesizer with Python is featured in this software repository: https://github.com/anwaldt/py2faust_synth
Python & JACK
The JACK Audio Connection Kit Client for Python by Matthias Geier connects Python processes to the JACK server: https://github.com/spatialaudio/jackclient-python/
This integration of Python in a JACK ecosystem can be helpful not only for audio processing, but also for synchronization of processes.