python viewer.py helloworld.py 
/Library/Frameworks/Python.framework/Versions/2.4/Resources/Python.app/Contents/MacOS/Python: can't open file 'viewer.py': [Errno 2] No such file or directory
alist-lap:~ vegan$ python /Library/Frameworks/Python.framework/
Headers    Python     Resources  Versions   
alist-lap:~ vegan$ python /Library/Frameworks/Python.framework/Versions/2.4/bin/viewer.py helloworld.py 
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.4/bin/viewer.py", line 63, in ?
    from cgkit.all import *
  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/cgkit/all/__init__.py", line 46, in ?
    from cgkit import _core
ImportError: Failure linking new module: /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/cgkit/_core.so: Symbol not found: __ZN5boost6python7objects10class_base12add_propertyEPKcRKNS0_3api6objectES8_S4_
  Referenced from: /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/cgkit/_core.so
  Expected in: dynamic lookup