The "production version" of your script should be running in your system environment with system packages. pyenv and friends should be used for testing with different versions and making sure you don't accidentally depend on idiosyncrasies of your box.
The exception is if your python thingy is "the main thing" running on a server, i.e. your customer facing webapp.
The exception is if your python thingy is "the main thing" running on a server, i.e. your customer facing webapp.
My $.10 anyway