How to set a python environment as default for .py files in XFCE?

Hi there! I have a general python environment to launch mostly all my python files, the thing is I want to launch some of those as an app, meaning just clicking on it and move on. When I try to set a default command

source ~/python-env/bin/activate && python %f

I keep getting the error failed to execute the application “activate && python” (not found in $PATH)
I figured that it is beacuse I am not running a bash command? What should I do?