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This is what I do, try the same but add this path "C:\Program Files (x86)\PTI\PSSEXplore34\PSSBIN\

pssbin34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSBIN'

psspy34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY27'

psspy34py3 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY34'
    
path_psspy = paths.psspy34 # assume python 2

    if sys.version_info[0] >= 3:  # if using Python 3:
        path_psspy = paths.psspy34py3

    sys.path.insert(0, paths.pssbin34) # add psse dir to path, required for import psspy
    sys.path.insert(0, path_psspy)
    os.environ['PATH'] += ';' + paths.pssbin34  # this tells PSS/E where to find itself...
    os.environ['PATH'] += ';' + path_psspy 

This is what I do, try the same but add this path "C:\Program Files (x86)\PTI\PSSEXplore34\PSSBIN\do:

pssbin34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSBIN'

psspy34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY27'

psspy34py3 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY34'
    
path_psspy = paths.psspy34 # assume python 2

    if sys.version_info[0] >= 3:  # if using Python 3:
        path_psspy = paths.psspy34py3

    sys.path.insert(0, paths.pssbin34) # add psse dir to path, required for import psspy
    sys.path.insert(0, path_psspy)
    os.environ['PATH'] += ';' + paths.pssbin34  # this tells PSS/E where to find itself...
    os.environ['PATH'] += ';' + path_psspy 

This is what I do:

pssbin34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSBIN'

psspy34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY27'

psspy34py3 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY34'
    
path_psspy = paths.psspy34 # assume python 2

    if sys.version_info[0] >= 3:  # if using Python 3:
        path_psspy = paths.psspy34py3

    sys.path.insert(0, paths.pssbin34) # add psse dir to path, required for import psspy
    sys.path.insert(0, path_psspy)
    os.environ['PATH'] += ';' + paths.pssbin34  # this tells PSS/E where to find itself...
    os.environ['PATH'] += ';' + path_psspy 

This is what I do:

pssbin34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSBIN'

psspy34 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY27'

psspy34py3 = r'C:\Program Files (x86)\PTI\PSSE34\PSSPY34'
    
path_psspy = paths.psspy34 # assume python 2
    if sys.version_info[0] >= 3:  # if using Python 3:
        path_psspy = paths.psspy34py3
    sys.path.insert(0, paths.pssbin34) # add psse dirdirectory to first path, required forto import psspy
    sys.path.insert(0, path_psspy) # add psse directory to first path, required to import psspy
    os.environ['PATH'] += ';' + paths.pssbin34  # this tells PSS/E where to find itself...
    os.environ['PATH'] += ';' + path_psspy  # this tells PSS/E where to find itself...