iPython with different env (using anaconda)

AFAIK, different environments in anaconda (and in venv as well) are activated by prepending env path to $PATH environment variable. It means, that if some file (eg, ipython) is not found in env path (the first entry of $PATH), the system searches for it in consequent entries of $PATH and finds it in root environment (that stays in $PATH). To fix the behavior, you need to install its own copy of ipython to anaconda env:

1. In command prompt, activate the environment: source activate python35 (or simply activate python35, depending on the OS)
2. While in environment, issue the command conda install ipython-notebook

An addition to Andrey Sobolev solution,you should switch to conda install ipython for higher python3.x version and log out the environment by Ctrl+D or conda deactivate then activate again