venv and executing other python programs

[Martin Di Paola]

>>
>> That's correct. I tried to be systematic in the analysis so I tested all
>> the possibilities.
>
>Your test results were unexpected for `python3 -m venv xxx`. By
>default, virtual environments exclude the system and user site
>packages. Including them should require the command-line argument
>`--system-site-packages`. I'd check sys.path in the environment. Maybe
>you have PYTHONPATH set.

Nope, I checked with "echo $PYTHONPATH" and nothing. I also checked 
"sys.path" within and without the environment:

Inside the environment:

['', '/usr/lib/python37.zip', '/usr/lib/python3.7', 
  '/usr/lib/python3.7/lib-dynload', 
  '/home/user/tmp/xxx/lib/python3.7/site-packages']

Outside the environment:

['', '/usr/lib/python37.zip', '/usr/lib/python3.7', 
  '/usr/lib/python3.7/lib-dynload', 
  '/home/user/.local/lib/python3.7/site-packages', 
  '/usr/local/lib/python3.7/dist-packages', 
  '/usr/lib/python3/dist-packages']

Indeed the "sys.path" inside the environment does not include system's 
site-packages.

I'll keep looking....

>A virtual environment is configured by a "pyvenv.cfg" file that's
>either beside the executable or one directory up. Activating an
>environment is a convenience, not a requirement.

Thanks, that makes a little more sense!

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