Christopher Barker wrote:
> I think it’s a “Bad Idea” to use an environment variable — who knows what
> Python script may be running on a given system?
> But a standard command line argument to the interpreter could be useful.

Can you clarify what the concern is about other Python scripts running? Why doesn't that apply to [all the other special PYTHON* environment variables](https://docs.python.org/3/using/cmdline.html#environment-variables), such as `PYTHONWARNINGS` or `PYTHONVERBOSE`?

Command line arguments only work if you're invoking the `python` command directly. If you're running something above that like a bash script or a package entrypoint it's more complicated. And configuring environment variables is sometimes easier than changing a command or editing a script, like when you're configuring a service hosted in the cloud (personally I'm thinking of AWS ECS).

I say do the same thing as so many other options and offer both a command line argument and an environment variable. I don't think many people will be setting the environment variable in their global shell profiles. When I want to set PYTHONPATH I usually write:

    PYTHONPATH=/some/path python script.py

which has no chance to affect anything else.
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