I've gotten myself into some kind of horrible virtualenv mess. Help?!

I manage environments with `conda`. Until recently, I only had a python2 jupyter notebook kernel, but I decided to drag myself kicking and screaming into the 21st century and installed a python3 kernel; I forget how I did it. 

My main (anaconda) python defaults to 2.7. 

So here I am, merrily trying to use beautiful soup from inside my shiny new python3 kernel, and I don't seem to be able to do anything to get at whatever environment it's finding packages in. Viz (all from notebook): 

```
from bs4 import BeautifulSoup 

-> ImportError: No module named 'bs4'

```

Ok, fine, I'll install it using shell magic. Right? Right? 

```
! pip install bs4

--> Collecting bs4
  Downloading bs4-0.0.1.tar.gz
Requirement already satisfied (use --upgrade to upgrade): beautifulsoup4 in /Users/[MY-USER]/anaconda/lib/python2.7/site-packages (from bs4)
[...]
Successfully built bs4
Installing collected packages: bs4
Successfully installed bs4-0.0.1

from bs4 import BeautifulSoup 

-> ImportError: No module named 'bs4'

```

Oh no. Does it think I'm in a 2.7 env even though I'm running a python3 kernel? That won't do. 

```
! conda info --envs
--> # conda environments:
#
flaskenv                 /Users/[MY-USER]/anaconda/envs/flaskenv
mesa                     /Users/[MY-USER]/anaconda/envs/mesa
py35                     /Users/[MY-USER]/anaconda/envs/py35
root                  *  /Users/[MY-USER]/anaconda

```

Ok, I can fix that. One of those is a 3.5 env.

```
! source activate py35
--> prepending /Users/[MY-USER]/anaconda/envs/py35/bin to PATH

! conda install beautifulsoup4
--> Fetching package metadata .......
Solving package specifications: ..........

# All requested packages already installed.
# packages in environment at /Users/[MY-USER]/anaconda:
#
beautifulsoup4            4.4.1                    py27_0  

```

concerning... 

```
! pip install bs4
--> Requirement already satisfied (use --upgrade to upgrade): bs4 in /Users/[MY-USER]/anaconda/lib/python2.7/site-packages

```

more concerning... 

```
from bs4 import BeautifulSoup 

-> ImportError: No module named 'bs4'

```

ARRGH!!! *headdesk* Am I going to have to kill the kernel in order to fix this (and re-run a bit of work)? Is killing the kernel even going to work? How do I get my jupyter kernel to know what environment it's supposed to be running under?

thanks!