Pyomo 4.3.11377 - ImportError: cannot import name '_VarDataWithDomain'

[stl...@gmail.com]

I use Anaconda Python 3.5.1. Tody I have updated Pyomo to 4.3.11377 and I get the following error:

Traceback (most recent call last):

  File "D:\runme.py", line 1, in <module>

    from pyomo.environ import *

  File "C:\Anaconda3\lib\site-packages\pyomo\environ\__init__.py", line 70, in <module>

    _import_packages()

  File "C:\Anaconda3\lib\site-packages\pyomo\environ\__init__.py", line 67, in _import_packages

    pkg.load()

  File "C:\Anaconda3\lib\site-packages\pyomo\core\plugins\__init__.py", line 12, in load

    import pyomo.core.plugins.transform

  File "C:\Anaconda3\lib\site-packages\pyomo\core\plugins\transform\__init__.py", line 16, in <module>

    import pyomo.core.plugins.transform.linear_dual

  File "C:\Anaconda3\lib\site-packages\pyomo\core\plugins\transform\linear_dual.py", line 27, in <module>

    from pyomo.repn.collect import collect_linear_terms

  File "C:\Anaconda3\lib\site-packages\pyomo\repn\__init__.py", line 13, in <module>

    from pyomo.repn.canonical_repn import *

  File "C:\Anaconda3\lib\site-packages\pyomo\repn\canonical_repn.py", line 31, in <module>

    from pyomo.core.base.var import _VarDataWithDomain, SimpleVar, Var, _VarData

ImportError: cannot import name '_VarDataWithDomain'

Have somebody an idea what the problem it is?

[Siirola, John D]

How did you install pyomo?  pip?  You can try:

 

                pip uninstall pyomo

                pip install pyomo --no-binary

 

and see if that fixes things.  We have had numerous reports of problems (usually with variants of Python3 and/or Anaconda), and they seem to stem from the wheel that is generated on PyPI.

 

john

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[stl...@gmail.com]

Thank you for the quick answer. I installed pyomo with pip. I tryed to install pyomo with the --no-binary options. But now stops the installation at: "Collecting PyUtilib>5.3.5 (from pyomo)". The progress it is frozen.

Thomas

[stl...@gmail.com]

I solved the problem:

1. I installed PyUtilib: conda install -c https://conda.anaconda.org/conda-forge pyutilib

  (https://github.com/PyUtilib/pyutilib)

2. For pyomo: pip install pyomo==4.3.11328

(http://stackoverflow.com/questions/36886524/installing-pyomo-windows-10)

[William Hart]

Can you confirm that you're using Windows 10?

Bill

[stl...@gmail.com]

I'am using Windwos 7 64bit and  Anaconda3-4.0.0-Windows-x86_64, not Windows 10!

[Bill Hart]

OK.  I just created a new release of Pyomo that looks better.

--Bill