Version 1.7.0

[1.7.0] - 2026-04-20

Added

• Support for sparse Hessians in the SciPy interface.
  #301
• Support for Python 3.14.
  #306
• Installation supports pip extras:
  pip install cyipopt[docs,examples,tests].

Changed

• ipopt_wrapper C extension module is now installed into the
  site-packages/cyipopt/ directory instead of the top level
  site-packages/. Importing directly from ipopt_wrapper with
  import ipopt_wrapper or from ipopt_wrapper import Problem is
  deprecated. Use import cyipopt.ipopt_wrapper. This replaces the
  prior deprecated cyipopt/ipopt_wrapper.py functionality, see below.
  #317
• Ipopt DLLs are installed into site-packages/cyipopt instead of
  site-packages/ when using setup.py adjacent Ipopt binaries. No
  deprecation for accessing these DLLs from site-packages/.
  #317

Removed

• Removed the docs/requirements.txt file in favor of
  docs/rtd-env.yml and pip install cyipopt[docs].
• Removed deprecated cyipopt/ipopt_wrapper.py, use
  scipy_interface.py instead. cyipopt/ipopt_wrapper.py was legacy
  code from when the package name was ipopt and long been deprecated.
  Note that this has been replaced by the C extension module named
  ipopt_wrapper, see above.
  #309

Fixed

• If no hessian function is provided to minimize_ipopt then the Ipopt
  limited memory hessian should be used. A bug was fixed that prevented
  this due the hessian method always being present on
  IpoptProblemWrapper. If there is a hessian attribute, then Problem
  would assume there is a dense hessian when it should have been
  triggered to use the limited memory hessian option. The hessian
  attribute is no longer present on IpoptProblemWrapper when a hessian
  function is not provided. This is backwards incompatible, but was
  broken and did not function in the current state, so no deprecation is
  made. #323

What's Changed

• Change from macos-13 to macos-15-intel image on Github CI. by @moorepants in #297
• Replace disutils.sysconfig.get_python_lib() with sysconfig.get_path('purelib'). by @moorepants in #300
• Implemented support for sparse objective function hessian. by @dimasad in #301
• Add support for Python 3.14. by @moorepants in #306
• Remove the ipopt_wrapper.py module as it serves no purpose since we purged importing from ipopt. by @moorepants in #309
• Update actions by @moorepants in #310
• Move the compiled module into the cyipopt install directory. by @moorepants in #317
• Remove deprecated fetch_build_eggs(), fixes #311. by @moorepants in #320
• Only add hessian attribute to IpoptProblemWrapper if hess kwarg is not None. by @moorepants in #323

New Contributors

• @dimasad made their first contribution in #301

Full Changelog: v1.6.1...v1.7.0