Most of the codebase of CSQ is being migrated to Python from C/C++. This is because Python is easier to learn and use than C/C++. Also, Python is more portable than C/C++. The migration is being done in a way that the codebase can be easily ported back to C/C++ if needed. All the C/C++ code is still available.
You can contribute to the migration by creating a pull request.