link psse34 to python

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i want to link python to pssexplore34 how can i do it? when i used below code i got this msg "ImportError: DLL load failed: The specified module could not be found.". my code is :

import sys import os

PSSE_PATH= r'C:\Program Files\PTI\PSSEXplore34\PSSPY27'

sys.path.append(PSSEPATH) os.environ['PATH']+=';'+ PSSEPATH

import psspy