pyomo.environ failed to import pyomo.opt.plugins

[Osvaldo Illescas]

Well, that's the error I'm getting. Upgrading Spyder and Pyomo didn't solved it.

Here's complete traceback;

Original ImportError: pyutilib.enum has been removed.

Python 3 now has an enum implementation in the standard library (also

available for older Python versions as the third-party enum34 PyPI

package) that supersedes this library.

Traceback:

  File "C:\Users\Osvaldo\Anaconda3\lib\site-packages\pyomo\environ\__init__.py", line 69, in _import_packages

    _do_import(pname)

  File "C:\Users\Osvaldo\Anaconda3\lib\site-packages\pyomo\environ\__init__.py", line 16, in _do_import

    importlib.import_module(pkg_name)

  File "C:\Users\Osvaldo\Anaconda3\lib\importlib\__init__.py", line 127, in import_module

    return _bootstrap._gcd_import(name[level:], package, level)

  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import

  File "<frozen importlib._bootstrap>", line 983, in _find_and_load

  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked

  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed

  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import

  File "<frozen importlib._bootstrap>", line 983, in _find_and_load

  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked

  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked

  File "<frozen importlib._bootstrap_external>", line 728, in exec_module

  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed

  File "C:\Users\Osvaldo\Anaconda3\lib\site-packages\pyomo\opt\__init__.py", line 11, in <module>

    from pyomo.opt.base import *

  File "C:\Users\Osvaldo\Anaconda3\lib\site-packages\pyomo\opt\base\__init__.py", line 14, in <module>

    from pyomo.opt.base.convert import *

  File "C:\Users\Osvaldo\Anaconda3\lib\site-packages\pyomo\opt\base\convert.py", line 16, in <module>

    from pyomo.opt.base.formats import guess_format

  File "C:\Users\Osvaldo\Anaconda3\lib\site-packages\pyomo\opt\base\formats.py", line 16, in <module>

    from pyutilib.enum import Enum

  File "C:\Users\Osvaldo\Anaconda3\lib\site-packages\pyutilib\enum\__init__.py", line 18, in <module>

    package) that supersedes this library.""")

[Siirola, John D]

This looks like a mismatch between Pyomo and PyUtilib, where you have PyUtilib 6.0, but Pyomo < 5.7.  Either upgrade you Pyomo to 5.7 (or 5.7.1) or downgrade PyUtilib to 5.8.

 

John

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