We are pleased to announce the release of Pyomo 4.0 (4.0.9682). Pyomo is a collection of Python software packages that supports a diverse set of optimization capabilities for formulating and analyzing optimization models.

This release patch release for Pyomo 4.0.9638. The following are highlights of this release:

- Modeling
* Added a ComplementarityList component

- Solvers
* PySP test baseline updates

- Other
   * Bug fix for pickling results objects
   * Performance fix for ordered sets
   * Resolving a bug that disabled pyodbc support.
   * Added preliminary support for pypyodbc.
   * Fix to enable sets to be initialized with a tuple
   * Re-enabled the 'import' and 'export' Pyomo data commands, which
     are still deprecated.
   * Various performance enhancements to avoid iterating over list of
     dictionary keys.

See http://pyomo.org for installation options and documentation for getting started with Pyomo.

Enjoy!

- Pyomo Developer Team
- pyomo-developers@googlecode.com
- http://pyomo.org

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About Pyomo
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The Pyomo home page provides resources for Pyomo users:

* http://pyomo.org

Pyomo development is hosted by Sandia National Laboratories and COIN-OR:

* https://software.sandia.gov/pyomo
* https://projects.coin-or.org/Pyomo

See the Pyomo Forum for online discussions of Pyomo:

* http://groups.google.com/group/pyomo-forum/

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Announcing Release of Pyomo 4.0.9682

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