You need python and a python test runner, for example pytest. An easy way to setup an isolated environment for your TDD project is to use the conda package manager.
conda create -n tddpy pytest
This creates a environment with the name tddpy ready-made with python, pytest and other modules that pytest depends on. You change to this environment via
source activate tddpy
and leave it via
source deactivate
cd tdd_setup_python
pytest
This will run all the assertions in the functions with name pattern "test_*" in the files matching "test_*.py". You will see one failing test that you can sure fix easily by modifying test_simple_calculator.py :)