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Simplified PSSe python importing

Project description

pssepath - Easy PSSE Python coding

author: whit. (

pssepath simplifies the code required to setup the Python environment necessary to use the PSSE API. Using pssepath all you have to do is::

    import pssepath

    import psspy

Tested and works on:

  • PSSE 32
  • PSSE 33
  • PSSE 34

Supports 32 and 64 bit windows (and provides warnings when using mismatched 64 bit python when PSSE requires 32 bit python).

Using this module makes the PSSE system files available for use while avoiding making modifications to system paths or hardcoding the location of the PSSE system folders. This makes PSSE easy to use.

Without pssepath, you have to do something like this::

    import os
    import sys

    PSSE_LOCATION = r"C:\Program Files\PTI\PSSE32\PSSBIN"
    os.environ['PATH'] = os.environ['PATH'] + ';' +  PSSE_LOCATION

    import psspy

Furthermore, by including pssepath with any scripts you distribute, others will be able to use your code without having to edit your code to suit their varying install paths (such as different versions of PSSE).

It can also provide information about which version of Python to use with a particular install of PSSE to avoid ImportError: Bad magic number....


pip install pssepath

or copy the pssepath code directory (the dir that contains to your project's root directory.


pssepath provides 3 methods for setting up the PSSE paths:

  • pssepath.add_pssepath()

    Adds the most recent version of PSSE that works with the currently running version of Python.

  • pssepath.add_pssepath(<version>)

    Adds the requested version of PSSE. Remember that specifying a version number may make your code less portable if you or your colleagues ever use a different version. pssepath.add_pssepath(33)

  • pssepath.select_pssepath()

    Produces a menu of all the PSSE and Python installs on your system, along with the required version of Python.

If you have set up your system to have the PSSE system files on the system path at all times, pssepath will only use these files.

For information about the PSSE versions installed on your system, either:

  • execute the file from windows; or
  • run python -m pssepath.pssepathinfo You may have to specify the python install path: ie. c:\Python25\python -m pssepath.pssepathinfo or py.exe -2.5 -m pssepath.pssepathinfo

This will provide you with a summary similar to the following::

Found the following versions of PSSE installed:

    1. PSSE version 32
        Requires Python 2.5-32bit (Current running Python)
    2. PSSE version XX
        Requires Python 2.X-32bit (Installed)
    3. PSSE version XX
        Requires Python 2.X-32bit

Found the following Python installations:
  2.5-32bit (currently running):
    PythonCore: C:\Python25\
    PythonCore: C:\Users\dan\AppData\Local\Programs\Python\Python37\

The status next to the Python version indicates the installation status of the required Python for the particular PSSE install.

  • Current running Python

    indicates the Python version used to invoke the script (c:\Python25\python.exe if invoked as c:\Python25\python.exe -m pssepath) is appropriate for that version of PSSE.

  • Installed

    indicates that a Python version different to the one used to invoke the script is required for that PSSE version, but that it is already installed on your system.


The absence of a status means that a different version of Python is required to run that version of PSSE and it is not installed on your system. As Python comes bundled with PSSE, this status is unlikely.

Ensuring you use the correct version of Python for the version of PSSE you are running will avoid seeing ImportError: Bad magic number... ever again.


This program is released under the very permissive MIT license. You may freely use it for commercial purposes, without needing to provide modified source.

Read the LICENSE file for more information.

Tips on managing multiple Python versions

I like to use batch files that point to a specific python version. For example::

$ more C:\bin\python25.bat
@C:\Python25\python.exe %*

Where the PATH includes c:\bin. Now you can run python scripts with the command::

python25 args

instead of:

c:\Python25\python.exe args


Discussion about this module was conducted at the Python for PSSE Forum involving the following members:

  • Daniel Hillier
  • JervisW
  • Chip Webber

Improvements or suggestions

Visit the Python for PSSE Forum

See also:

For any other questions about Python and PSSE, feel free to raise them on the Python for PSSE Forum

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