%~dp0\bin\Iris.exe
%~dp0 resolves to the full path of the folder in which the batch script resides.
Or
venv\Scripts\python.exe main.py
References
https://stackoverflow.com/questions/14936625/relative-path-in-bat-script/14942944
%~dp0\bin\Iris.exe
%~dp0 resolves to the full path of the folder in which the batch script resides.
Or
venv\Scripts\python.exe main.py
References
https://stackoverflow.com/questions/14936625/relative-path-in-bat-script/14942944