I tried to reproduce the problem you're running into using this sample code:
import tensorflow as tf
hello = tf.constant('Hello, Tensorflow!')
But I was not able to. I can run the script without issues within PyCharm and in my command line (exit code 0).
These are the packages (and their version) that are required for tensorflow 0.8.0 to work:
numpy==1.11.0
protobuf==3.0.0b2
six==1.10.0
I'm using PyCharm Community Edition 2016.1.2 and Python 2.7.10 on Mac OS X 10.11.4
How did you install tensorflow?
You should install it via pip (as recommended by the site: https://www.tensorflow.org/versions/r0.8/get_started/os_setup.html#pip-installation)
For Python 2, Mac OS X, this is the installation command:
pip install --upgrade https://storage.googleapis.com/tensorflow/mac/tensorflow-0.8.0-py2-none-any.whl