On Fri, Nov 8, 2019 at 10:01 AM Ricky Teachey <ri...@teachey.org> wrote:
> throwing this idea out there, no idea if it is practical but it might be > pretty nice/easily understood syntax. > > could a context manager be created such that anything imported under it is > guaranteed to be imported from the standard library, and produce an error > otherwise? perhaps by adding a level keyword argument to the __import__ > built in. > __import__ already has a 'level' argument. > > something like: > > with __import__(level="std"): > # imports guaranteed to fail of not in the standard library > from pathlib import Path > from sys import argv > > with __import__(level="package"): > # imports guaranteed to fail of not in the current package > import mod1 > import mod2 > > with __import__(level="local"): > # imports guaranteed to fail of not in the local directory > import mod1 > import mod2 > > with __import__(level="site"): > # imports guaranteed to fail if not in site-packages, or some other > definition that makes sense > import numpy as np > Not without frame inspection to know what import statements are in the context manager's block. This can all be done with code which calls importlib.import_module() and checks __spec__.origin to see where the module came from. Basically if you're willing to give up the syntax support of 'import' statements (which are just calls to __import__ with some assignments afterwards to bind things to names) you can have this protection today without adding syntax (which is always a massive ask).
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