Variables that should be set in order to work with gdcmPython:
GDCM_DATA_ROOT path to gdcmData
PYTHONPATH path to both 
 - GDCM_BIN
 - GDCM_BIN/bin (for linux) or GDCM_BIN/bin/Release (for Windows)

e.g.

export GDCM_DICT_PATH=~/cvs/gdcm/Dicts/
export GDCM_DATA_PATH=~/cvs/gdcmData/
export PYTHONPATH=~/cvs/gdcmbin/bin:~/cvs/gdcmbin/