import graph tool doesn't work on iPython
Question: I installed graph-tool on ubuntu. When trying to import it in iPython I get an
error:

    
    
    ImportError: No module named graph_tool.all
    

As I read in other posts it might be possible that I used a different version
of python for installing graph-tools than the system version I'm using. My
question is now, how do I check which version graph-tool is installed with and
how do i change this in order to import it? Thanks for any advice!


Answer: If you install using `pip` you can check

    
    
    pip -V
    

result (for example)

    
    
    pip 8.0.2 from /usr/local/lib/python3.5/dist-packages (python 3.5)
    

You should have `pip`, `pip2`, `pip2.7`, `pip3`, `pip3.4`, etc. to install
with different Python.

(in bash write `pip` and press `tab` twice to see all programs started with
`pip`)

