Set your virtualenv for tensorflow base on Anaconda
$ conda install virtualenv # suggested by the output of terminal not using pip install
$ conda create --name=tensorflow_env python=2.7
$ source activate tensorflow_env$ pip install --upgrade [https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.5.0-cp27-none-linux_x86_64.whl](https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.5.0-cp27-none-linux_x86_64.whl) # this is for python2