Run tlt command in the python program with os.system or subprocess


I want to run tlt detectnet_v2 dataset_convert in a python program, because I am working with TDD (Test Development Driver), when I use:
os.systeme () or subprocess () to launch the command line, it gives me an error message: tlt: no found
knowing that in the terminal, we can find the functionalities of tlt.
any suggestions please
thank you

Please follow TLT Launcher — Transfer Learning Toolkit 3.0 documentation
The tlt tool is available after installing tlt launcher python package called nvidia-tlt