WinPython and Pyomo

[Andreas Knaut]

Hi,
I am trying to use Coopr Pyomo with my WinPython installation ( I tried both 2.7 and 3.3). After installing with pip and typing "import coopr.pyomo" I always get the error:
"Error loading 'pyutilib.component' entry points: 'type object 'PluginGlobals' has no attribute 'add_env''"

Does anyone have a clue what went wrong here?

Thanks!
Andreas

[Siirola, John D]

Ick.  I think I do.  I fear that the Coopr 3.5 dependency on the version of PyUtilib is specified as a >= and not a ==.  Bill just cut a new release of PyUtilib, and I suspect that the new version is not backwards-compatible with the old, so Coopr is failing.

 

Bill:  Can you confirm, and is it possible to back-patch PyUtilib 5.x so that I can still work with Coopr 3.x?  Otherwise, can we cut a Coopr 3.5.1 release of just the Coopr metapackage that switches to an “==” dependency on PyUtilib?  This just further reinforces that we need to get Pyomo 4.0 out asap.

 

Andreas:  One possible workaround is to switch to Pyomo trunk.  A rough procedure would be something like:

 

1)      uninstall all coopr packages from your Python’s lib\site-packages directory.  You can use “pip uninstall” for this, but you need to uninstall each of the ~dozen coopr.* packages individually.

2)      make sure that you still have Pyutilib 5.0 installed.  I would look in the pyutilib/setup.py file to verify, but there is probably an easier way.

3)      do an subversion checkout of coopr trunk:  “svn checkout https://software.sandia.gov/svn/pyomo/pyomo/trunk pyomo” into whatever directory you want

4)      cd into that directory and run “python setup.py install”

 

Alternatively, after uninstalling both coopr.* and pyutilib from your python, you can use the “pyomo_install” script from the project download page to set up a “virtual” python installation pointing at pyomo trunk (this is what the developers do when working on the code).

 

john

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[Andreas Knaut]

Thanks John. So I know at least what is going on. Maybe I'll try uninstalling the Coopr packages and switch to Pyomo trunk.

When will the Pyomo 4.0 Version be released?

Andreas

[Siirola, John D]

We are hoping that 4.0 will be out before the 24^th.

[William Hart]

I think the issue that we updated pyutilib.autodist and there were some app changes that impacted coopr.

Well have a new coopr/pyomo release within a week.

Bill

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