[rterzi]

#!/usr/bin/env python is almost guaranteed to give you a surprise at some point. If someone has a virtualenv or conda env active in that shell it will be a different python environment (with different installed modules) than in other shells.

[CoolGuySteve]

At least in the build-system glue language use case, the 'batteries included' modules like os, sh, glob, etc will all be there.

Similarly, if you require pandas like I do, there's a fairly comprehensive baseline of functionality you can expect regardless of what environment it comes from.