[Tutor] Virtual environment question

[Jim]

It was my understanding that using a virtual environment kept everything 
isolated in that environment. So I was surprised when I got the 
following error message.

(env) jfb at jims-mint18 ~ $

<snip>
File 
"/home/jfb/EVs/env/lib/python3.5/site-packages/selenium/webdriver/remote/remote_connection.py", 
line 528, in _request
     resp = opener.open(request, timeout=self._timeout)

   File "/usr/lib/python3.5/urllib/request.py", line 466, in open
     response = self._open(req, data)
<snip>

I snipped most of the error msg because for the purpose of this question 
I am not interested in them. I tried  something that I did not think 
would work and it did not.

I am wondering why the path for the first line and every line above it 
is /home/jfb/EVs/env and the second line and everything after is is
/usr/lib/.

I didn't think anything from my system python would be involved if I 
started from a virtual environment.

Regards,  Jim