Pyomo/pyomo 6.9.5

Pyomo 6.9.5

on GitHub

Highlights of the 6.9 release series

• Removed support for Python 3.8
• Added support for Python 3.14
• New Logic-Based Discrete-Steepest Descent Algorithm in GDPOpt
• New External Function for Cubic Spline Interpolation
• New ASL External Functions Library
• New solver interfaces:
  • knitro_direct KNITRO Python bindings interface
  • Add gurobi_direct support for MINLP
  • v2: Ongoing solver interface refactor
• ...and of course numerous minor bug fixes and performance enhancements

Changes in this release

SIGNIFICANT CHANGE NOTICE

• This will be the last release to support Python 3.9
• This is the first release to be tested against Python 3.14

CHANGELOG

• General
  • Add Python 3.14 as a supported version (#3749, #3728)
  • New Typos Updates (#3715, #3739)
  • Modernization: Convert to new implicit standard for classes (#3654)
  • Fix boolean conversion in DeferredImportIndicator class (#3746)
• Core
  • LinearExpression should return tuples instead of lists (#3751)
  • Initializing Config containers shouldn't mark as "user set" (#3722)
• Documentation
  • Update URLs in source code (#3755)
• Solver Interfaces
  • Set Gurobi LogToConsole instead of OutputFlag to handle "tee" (#3716)
  • New KNITRO direct solver interface (#3707)
  • Add Gurobi direct support for MINLP (#3745)
  • Bugfix: IPOPT log parser and no objective case (#3738)
  • Add test to ensure Results object is populated fully (#3709)
  • Mark that AMPL Gurobi 12.0.3 returns incorrect dual values (#3750)
  • Gams gurobi valid solvers fix (#3714)
  • Validate new api_version() method, implement on wrapper classes (#3717)
• Testing
  • Update to pypy3.11 and ignore pint (#3756)
• Contributed Packages
  • alternative_solutions: Gurobi solution pool tweak (#3726)
  • DoE: Finish GreyBox / ME-opt Hessian (#3740, #3727)
  • DoE: Measurement error convention correction (#3723)
  • piecewise: Fix deprecation in NonlinearToPWL/LinearRepnVisitor (#3752)
  • PyROS: Restructure and add tutorial to online documentation (#3733)
  • PyROS: Modify the logging system (#3732)
  • PyROS: Ensure support for problems With no Vars/uncertain Params (#3720)