Python Constraint Changelog

All notable changes to this code base will be documented in this file, for every released major and minor version. For all versions, see releases.

Version 2.5.0

• Released: 2026-01-08
• Issues / Enhancements:
  • Added Python 3.14 support.
  • Resolved issue #103 relating to pruning.
  • Various minor improvements.

Version 2.4.0

• Released: 2025-07-23
• Issues / Enhancements:
  • MinSumConstraint is now much faster thanks to preprocessing.
  • Variables values can be instantiated with any type that can be iterable, such as sets.
  • Two issues (#13 and #65) relating to the examples have been resolved.
  • Various minor improvements.

Version 2.3.0

• Released: 2025-06-17
• Issues / Enhancements:
  • Python Constraint now has an entirely new type of built-in constraints, allowing comparisons with variables on both sides to be evaluated much more efficiently.
  • Constraint rewriting has been extended to include minus and division operators.
  • Rewriting of restrictions with less-than or greater-than operators now supports floats as well.
  • Tests have been extended and amended to reflect changes introduced.
  • Documentation has been extended and amended to reflect changes introduced.
  • Various minor bugs have been resolved.

Version 2.2.0

• Released: 2025-03-25
• Issues / Enhancements:
  • Automatic performance benchmarking and validation with real-world cases and automatic reporting (see #93).
  • Preparations for free-threading (no GIL) capabilities (see #94).
  • Removed NumPy dependency in micro benchmarks, updated dependencies, and optimized test interfaces.
  • Changed development status from Beta to Production / Stable.

Version 2.1.0

• Released: 2025-02-11
• Issues / Enhancements (see #91 for more details):
  • Implemented a new string format for constraints, that is automatically parsed to constraint types (currently in beta, please report issues)
  • Implemented a new ParallelSolver with both Thread and Process mode (currently experimental)
  • Added Python 3.13 and experimental 3.14 support

Version 2.0.0

• Released: 2025-01-29
• Maintainer: Floris-Jan Willemsen [email protected]
• Issues / Enhancements:
  • Cythonized the package
  • Added the OptimizedBacktracking solver based on issue #62
  • Added type-hints to improve Cythonization
  • Added the MaxProd and MinProd constraints
  • Improved pre-processing for the MaxSum constraint
  • Optimized the Function constraint
  • Added getSolutionsOrderedList and getSolutionsAsListDict functions for efficient result shaping
  • Overall optimization of common bottlenecks
  • Split the codebase into multiple files for convenience
  • Switched from setup.py to pyproject.toml
  • Added nox for testing against all supported Python versions
  • Added ruff for codestyle testing
  • Achieved and requires test coverage of at least 80%
  • Moved the documentation to GitHub Pages
  • Moved test & publishing automation to GitHub Actions
  • Switched dependency & build system to Poetry
  • Dropped Python 3.4, 3.5, 3.6, 3.7, 3.8 support

Version 1.4.0

• Released: 2018-11-05
• Issues / Enhancements:
  • Add tests around SomeNotInSetConstraint.
  • Minor README fixes
  • Fix dict.keys() issue with Python 3 and add some unit tests
  • Drop Python 3.3 support

Version 1.3.1

• Released: 2017-03-31
• Issues / Enhancements:
  • Better README rendering (using reStructuredText)

Version 1.3

• Released: 2017-03-31
• Maintainer: Sébastien Celles [email protected]
• Issues / Enhancements:
  • Original code forked from https://labix.org/python-constraint
  • Publish on Github
  • Python 2 / 3 support
  • Remove Python 2.6 support
  • Unit tests and continuous integration
  • Create a registered pip instalable package
  • PEP8

Initial development

• Author: Gustavo Biemeyer [email protected]
• URL: https://labix.org/python-constraint