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From rev 34 it is not needed to set the path. Just do import psse34, see below:

import sys,os
ver = 34

if ver == 33:
    strPssePath = ''  # path to PSSE program executable
    if os.path.exists(r'C:\Program Files (x86)\PTI\PSSE33'):  # 32-bit applications
        strPssePath = r'C:\Program Files (x86)\PTI\PSSE33'
    elif os.path.exists(r'C:\Program Files\PTI\PSSE33'):  # 64-bit applications
        strPssePath = r'C:\Program Files\PTI\PSSE33'

    sys.path.append(os.path.join(strPssePath, 'PSSBIN'))
    sys.path.append(os.path.join(strPssePath, 'PSSLIB'))
    os.environ['PATH'] += ';' + os.path.join(strPssePath, 'PSSBIN')
    os.environ['PATH'] += ';' + os.path.join(strPssePath, 'PSSLIB')

elif ver == 34:
    import psse34

import psspy
import redirect
redirect.psse2py()
psspy.psseinit(150000)
print psspy.psseversion()