Choosing a python bundle for PyROOT

After played with python 2.7 for a while, I got a need for ROOT drawings. So, I decided to try PyROOT which was supposed to be installed already in my ROOT 5.34.09 installation:

% port -v installed root

The following ports are currently installed:

  root @5.34.09_1+graphviz+gsl+minuit2+opengl+python27+roofit+soversion+ssl+tmva+xml (active) platform='darwin 12' archs='x86_64'

OK, python27 is there. But my python told

% python -c "import ROOT"

Traceback (most recent call last):

  File "<string>", line 1, in <module>

ImportError: No module named ROOT

Well, PyROOT needs two files, ROOT.py and libPyROOT.so which must be visible from python. Where are they?

% port contents root | grep ROOT.py

  /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/ROOT.py

% port contents root | grep libPyROOT.so

  /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/libPyROOT.so

  /opt/local/lib/root/libPyROOT.so

OK, you guys are there. But when I make these guys visible (by copying or symbolic links) from python, it told

% python -c "import ROOT"

Fatal Python error: PyThreadState_Get: no current thread
Abort trap: 6

What's wrong? After for a while, I found the bundle of python which I was using did not fit with the guy libPyROOT.so, who came through macport. To use this guy, I need to switch my python to the one came also from macport. This one was installed as /opt/local/bin/python2.7, and

%/opt/local/bin/python2.7 -c "import ROOT"

Passed!  What is the difference between 'em?

%/usr/bin/python
Python 2.7.5 (default, Aug  1 2013, 01:01:17)
[GCC 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))] on darwin

%/opt/local/bin/python2.7

Python 2.7.5 (default, Aug 25 2013, 00:04:04) 

[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin

Well, well, well. I can set my default python as the later one by, for instance,

sudo ln -s /opt/local/bin/python2.7 /opt/local/bin/python

and exporting PATH with /opt/local/bin placed earlier than /usr/bin so that I can just write, e.g.

%python -c "from ROOT import TCanvas"