I was puzzling over that exact thing for maybe 15 minutes. I've never used either one. Neither is on my path currently, even though I just installed python 3.

I was puzzling over that exact thing for maybe 15 minutes. I've never used either one. Neither is on my path currently, even though I just installed python 3.5 with that option ticked. I can find pyvenv.py in my file system. Perhaps I'm expected to add it to my system path manually? Maybe I'll figure this out another day.