Make sure you are using deepstream 5.0, it comes preinstalled. Also you need to clone NVIDIA-AI-IOT/deepstream_python_apps inside /opt/nvidia/deepstream/deepstream/sources and follow the readme from github repo, you will be able to run test apps.
Deepstream 5 installs on my NX with this path:
/opt/nvidia/deepstream/deepstream5.0/sources`
The Readme says PYDS is located in the /lib folder;
Its not.
I have the python apps folder in the source folder.
Where is PYDS located?