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I received this answer in the past: " To initialize PSSe 35.x.y + python 39, the following would work:

import sys, os

psse_PATH=(r"""C:\Program Files\PTI\PSSE35\35.3\PSSBIN""")

pssepy_PATH=(r"""C:\Program Files\PTI\PSSE35\35.3\PSSPY39""")

sys.path.append(psse_PATH)

envpath = ';'+psse_PATH

os.environ['PATH'] += envpath

sys.path.append(pssepy_PATH)

envpathpy = ';'+pssepy_PATH

os.environ['PATH'] += envpathpy

import psspy psspy.psseinit()

or for single v.35 installation:

import sys, os import psse35 import psspy psspy.psseinit()

I received this answer in the past: " To initialize PSSe 35.x.y + python 39, the following would work:

import sys, osos #psse_PATH=(r"""C:\\Program Files\\PTI\\PSSE35\\35.3\\PSSBIN""") pssepy_PATH=(r"""C:\Program Files\PTI\PSSE35\35.3\PSSPY39""") #sys.path.append(psse_PATH) #envpath = ';'+psse_PATH #os.environ['PATH'] += envpath sys.path.append(pssepy_PATH) #envpathpy = ';'+pssepy_PATH #os.environ['PATH'] += envpathpy psse_PATH=(r"""C:\Program Files\PTI\PSSE35\35.3\PSSBIN""") pssepy_PATH=(r"""C:\Program Files\PTI\PSSE35\35.3\PSSPY39""") sys.path.append(psse_PATH) envpath = ';'+psse_PATH os.environ['PATH'] += envpath sys.path.append(pssepy_PATH) envpathpy = ';'+pssepy_PATH os.environ['PATH'] += envpathpy import psspy psspy.psseinit()psspy.psseinit()

or for single v.35 installation:

import sys, os import psse35 import psspy psspy.psseinit()psspy.psseinit()

"