I understand this may be an old question, but still I cannot find solution from off-the-shelf Q$A. Here is the problem:
I am following Udacity \"Mac
After I tried Anaconda-installation (I was using the other installation methods, which are all shown in the link below) https://github.com/tensorflow/tensorflow/blob/master/tensorflow/g3doc/get_started/os_setup.md#anaconda-installation It worked ...
Further, on terminal activate tensorflow
>>> source activate tensorflow
before open iPython Notebook
>>> ipython notebook
At last, I have to restart my macbook to make it work....