On 2016-11-06, Chris Angelico <ros...@gmail.com> wrote: > On Sun, Nov 6, 2016 at 3:03 PM, Jon Ribbens <jon+use...@unequivocal.eu> wrote: >> I don't suppose anyone else more constructive and informed actually >> knows the answer to my rather simple question of how Python knows >> it's in a venv? ;-) > > Two ways. > > 1) Normally, you 'activate' the venv by sourcing a script into your > shell. This modifies $PATH, $PYTHONHOME, and I think a couple of other > environment variables.
It sets VIRTUAL_ENV, adds the virtualenv's bin directory to PATH, and *unsets* PYTHONHOME if set. That's it (modulo storing old values of variables and updating PS1 which is presumably just cosmetic). > 2) If Python notices that its executable comes from a venv, it uses it. Yes. My question is *how does it notice*? -- https://mail.python.org/mailman/listinfo/python-list
