tensorflow import error. With /Library/Python/2.7/site-packages not included

Trying to install tensorflow. Tried anaconda, it worked but affected my other program. Then decided to use pip install.

But after I installed it, I just can't import it within ipython.

Here are the messages: I tried uninstall and reinstall.

pip install tensorflow
Requirement already satisfied (use --upgrade to upgrade): tensorflow in /Library/Python/2.7/site-packages 
Cleaning up...

First I try to import in ipython:

In [1]: import tensorflow
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-a649b509054f> in <module>()
----> 1 import tensorflow

ImportError: No module named tensorflow

And then I copied the folder of tensorflow from /Library/Python/2.7/site-packages to /usr/local/lib/python2.7/site-packages/. I try to import:

In [1]: import tensorflow
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-a649b509054f> in <module>()
----> 1 import tensorflow

/Library/Python/2.7/site-packages/tensorflow/__init__.py in <module>()
     21 from __future__ import print_function
     22 
---> 23 from tensorflow.python import *
     24 
     25 

/Library/Python/2.7/site-packages/tensorflow/python/__init__.py in <module>()
     57 please exit the tensorflow source tree, and relaunch your python interpreter
     58 from there.""" % traceback.format_exc()
---> 59   raise ImportError(msg)
     60 
     61 from tensorflow.core.framework.node_def_pb2 import *

ImportError: Traceback (most recent call last):
  File "tensorflow/python/__init__.py", line 53, in <module>
    from tensorflow.core.framework.graph_pb2 import *
  File "tensorflow/core/framework/graph_pb2.py", line 6, in <module>
    from google.protobuf import descriptor as _descriptor
ImportError: No module named google.protobuf


Error importing tensorflow.  Unless you are using bazel,
you should not try to import tensorflow from its source directory;
please exit the tensorflow source tree, and relaunch your python interpreter
from there.

However, I have protobuf installed under /Library/Python/2.7/site-packages as well.

I find out this version of ipython is using macports python package directory: /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/

I am not sure how to let ipython search for the pip installed directory.

I reinstalled the tensorflow again as it is described on the website:

sudo pip install --upgrade $TF_BINARY_URL
Password:
Downloading/unpacking https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-0.11.0rc0-py2-none-any.whl
  Downloading tensorflow-0.11.0rc0-py2-none-any.whl (35.5MB): 35.5MB downloaded
Downloading/unpacking protobuf==3.0.0 (from tensorflow==0.11.0rc0)
  Downloading protobuf-3.0.0-py2.py3-none-any.whl (342kB): 342kB downloaded
Requirement already up-to-date: wheel in /Library/Python/2.7/site-packages (from tensorflow==0.11.0rc0)
Requirement already up-to-date: mock>=2.0.0 in /Library/Python/2.7/site-packages (from tensorflow==0.11.0rc0)
Requirement already up-to-date: numpy>=1.11.0 in /Library/Python/2.7/site-packages (from tensorflow==0.11.0rc0)
Requirement already up-to-date: six>=1.10.0 in /Library/Python/2.7/site-packages (from tensorflow==0.11.0rc0)
Downloading/unpacking setuptools from https://pypi.python.org/packages/be/20/3f4d2fb59ddeed35532bd4e11e900abcf8019d29f4558d38169639303536/setuptools-28.2.0-py2.py3-none-any.whl#md5=02e79b1127c5a131a2dace6d30cf7f25 (from protobuf==3.0.0->tensorflow==0.11.0rc0)
  Downloading setuptools-28.2.0-py2.py3-none-any.whl (467kB): 467kB downloaded
Installing collected packages: tensorflow, protobuf, setuptools
  Found existing installation: protobuf 3.1.0.post1
    Uninstalling protobuf:
      Successfully uninstalled protobuf
  Found existing installation: setuptools 18.5
    Uninstalling setuptools:
      Successfully uninstalled setuptools
Successfully installed tensorflow protobuf setuptools
Cleaning up...

And still no luck:

In [1]: import tensorflow
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-a649b509054f> in <module>()
----> 1 import tensorflow