• fixed object[] parameters having precedence over anything else compatible #1211
• fixed calling from Python methods, defined in F# with no names for a parameter #1375

Additionally, includes support for Python 3.9.

Backports two reference counting bugfixes from master.

Many thanks two the reporters who also provided the fixes:

• @DanBarzilian
• @lostmsu

⚠️ This release will be the last one supporting Python 2 and non-.NET-Standard builds.

This version improves performance on benchmarks significantly compared to 2.3 and includes various additions and improvements to the library.

Added

• Automatic NuGet package generation in appveyor and local builds
• Function that sets Py_NoSiteFlag to 1.
• Support for Jetson Nano.
• Support for __len__ for .NET classes that implement ICollection
• PyExport attribute to hide .NET types from Python
• PythonException.Format method to format exceptions the same as
  traceback.format_exception
• Runtime.None to be able to pass None as parameter into Python from .NET
• PyObject.IsNone() to check if a Python object is None in .NET.
• Support for Python 3.8
• Codecs as the designated way to handle automatic conversions between
  .NET and Python types

Changed

• Added argument types information to "No method matches given arguments" message
• Moved wheel import in setup.py inside of a try/except to prevent pip collection failures
• Removes PyLong_GetMax and PyClass_New when targetting Python3
• Improved performance of calls from Python to C#
• Added support for converting python iterators to C# arrays
• Changed usage of the obsolete function
  GetDelegateForFunctionPointer(IntPtr, Type) to
  GetDelegateForFunctionPointer<TDelegate>(IntPtr)
• When calling C# from Python, enable passing argument of any type to a
  parameter of C# type object by wrapping it into PyObject instance.
  ([#881][i881])
• Added support for kwarg parameters when calling .NET methods from Python
• Changed method for finding MSBuild using vswhere
• Reworked Finalizer. Now objects drop into its queue upon finalization,
  which is periodically drained when new objects are created.
• Marked Runtime.OperatingSystemName and Runtime.MachineName as
  Obsolete, should never have been public in the first place. They also
  don't necessarily return a result that matches the platform module's.
• Unconditionally depend on pycparser for the interop module generation

Fixed

• Fixed runtime that fails loading when using pythonnet in an environment
  together with Nuitka
• Fixes bug where delegates get casts (dotnetcore)
• Determine size of interpreter longs at runtime
• Handling exceptions ocurred in ModuleObject's getattribute
• Fill __classcell__ correctly for Python subclasses of .NET types
• Fixed issue with params methods that are not passed an array.
• Use UTF8 to encode strings passed to PyRun_String on Python 3

Acknowledgements

These authors have contributed to this release:

• @alexhelms
• @amos402
• @andreydani
• @benoithudson
• @chrisjbremner
• @Cronan
• @filmor
• @ftreurni
• @henon
• @inna-w
• @Jeff17Robbins
• @jmlidbetter
• @koubaa
• @lostmsu
• @m-rossi
• @matham
• @mjmvisser
• @NickSavin
• @s4v4g3
• @slide

v2.4.0

Bump version to 2.4.0

Bump all relevant versions to 2.4.0-rc2

Added

• Added support for embedding python into dotnet core 2.0 (NetStandard 2.0)
• Added new build system (pythonnet.15.sln) based on dotnetcore-sdk/xplat(crossplatform msbuild).
  Currently there two side-by-side build systems that produces the same output (net40) from the same sources.
  After a some transition time, current (mono/ msbuild 14.0) build system will be removed.
• NUnit upgraded to 3.7 (eliminates travis-ci random bug)
• Added C# PythonEngine.AddShutdownHandler to help client code clean up on shutdown.
• Added clr.GetClrType (#432)(#433)
• Allowed passing None for nullable args (#460)
• Added keyword arguments based on C# syntax for calling CPython methods (#461)
• Catches exceptions thrown in C# iterators (yield returns) and rethrows them in python (#475)(#693)
• Implemented GetDynamicMemberNames() for PyObject to allow dynamic object members to be visible in the debugger (#443)(#690)
• Incorporated reference-style links to issues and pull requests in the CHANGELOG (#608)
• Added detailed comments about aproaches and dangers to handle multi-app-domains (#625)
• Python 3.7 support, builds and testing added. Defaults changed from Python 3.6 to 3.7 ([#698][p698])

Changed

• Reattach python exception traceback information (#545)
• PythonEngine.Intialize will now call Py_InitializeEx with a default value of 0, so signals will not be configured by default on embedding. This is different from the previous behaviour, where Py_Initialize was called instead, which sets initSigs to 1. (#449)

Fixed

• Fixed secondary PythonEngine.Initialize call, all sensitive static variables now reseted.
  This is a hidden bug. Once python cleaning up enough memory, objects from previous engine run becomes corrupted. (#534)
• Fixed Visual Studio 2017 compat (#434) for setup.py
• Fixed crashes when integrating pythonnet in Unity3d (#714),
  related to unloading the Application Domain
• Fixed interop methods with Py_ssize_t. NetCoreApp 2.0 is more sensitive than net40 and requires this fix. (#531)
• Fixed crash on exit of the Python interpreter if a python class
  derived from a .NET class has a __namespace__ or __assembly__
  attribute (#481)
• Fixed conversion of 'float' and 'double' values (#486)
• Fixed 'clrmethod' for python 2 (#492)
• Fixed double calling of constructor when deriving from .NET class (#495)
• Fixed clr.GetClrType when iterating over System members (#607)
• Fixed LockRecursionException when loading assemblies (#627)
• Fixed errors breaking .NET Remoting on method invoke (#276)
• Fixed PyObject.GetHashCode (#676)
• Fix memory leaks due to spurious handle incrementation ([#691][i691])
• Fix spurious assembly loading exceptions from private types ([#703][i703])
• Fix inheritance of non-abstract base methods (#755)

Added

• Added Code Coverage (#345)
• Added PySys_SetArgvEx (#347)
• Added XML Documentation (#349)
• Added Embedded_Tests on AppVeyor (#224)(#353)
• Added Embedded_Tests on Travis (#224)(#391)
• Added PY3 settings to solution configuration-manager (#346)
• Added Slack (#384)(#383)(#386)
• Added function of passing an arbitrary .NET object as the value
  of an attribute of PyObject (#370)(#373)
• Added Coverity scan (#390)
• Added bumpversion for version control (#319)(#398)
• Added tox for local testing (#345)
• Added requirements.txt
• Added to PythonEngine methods Eval and Exec (#389)
• Added implementations of ICustomMarshal (#407)
• Added docker images (#322)
• Added hooks in pyinstaller and cx_freeze for pythonnet (#66)
• Added nuget packages (#165)

Changed

• Refactored python unittests (#329)
• Refactored python setup.py (#337)
• Refactored remaining of Build Directives on runtime.cs (#339)
• Refactored Embedded_Tests to make easier to write tests (#369)
• Changed unittests to pytest (#368)
• Upgraded NUnit framework from 2.6.3 to 3.5.0 (#341)
• Downgraded NUnit framework from 3.5.0 to 2.6.4 (#353)
• Upgraded NUnit framework from 2.6.4 to 3.6.0 (#371)
• Unfroze Mono version on Travis (#345)
• Changed conda.recipe build to only pull-requests (#345)
• Combine Py_DEBUG and PYTHON_WITH_PYDEBUG flags (#362)

Deprecated

• Deprecated RunString (#401)

Fixed

• Fixed crash during Initialization (#262)(#343)
• Fixed crash during Shutdown (#365)
• Fixed multiple build warnings
• Fixed method signature match for Object Type (#203)(#377)
• Fixed outdated version number in AssemblyInfo (#398)
• Fixed wrong version number in conda.recipe (#398)
• Fixed fixture location for Python tests and Embedded_Tests
• Fixed PythonException crash during Shutdown (#400)
• Fixed AppDomain unload during GC (#397)(#400)
• Fixed Py_Main & PySys_SetArgvEx no mem error on UCS4/PY3 (#399)
• Fixed Python.Runtime.dll.config on macOS (#120)
• Fixed crash on PythonEngine.Version (#413)
• Fixed PythonEngine.PythonPath issues (#179)(#414)(#415)

Removed

• Removed six dependency for unittests (#329)
• Removed Mono.Unix dependency for UCS4 (#360)
• Removed need for Python.Runtime.dll.config
• Removed PY32 build option PYTHON_WITH_WIDE_UNICODE (#417)

Fixed

• Missing files from packaging (#336)

News

• transition from Zope to MIT license is completed!
• 3 new pythonnet core developers @denfromufa @filmor @vmuriart
• 32+1 contributors
• clrmagic for IPython kernel
• presentation on PyOhio 2016

Changelog since v2.2.0-dev1

v2.2.0 had a release issue on pypi. Bumped to v2.2.1

Added

• Python 3.6 support (#310)
• Added __version__ to module (#312)
• Added conda recipe (#281)
• Nuget update on build (#268)
• Added __cause__ attribute on exception (#287)

Changed

• License to MIT (#314)
• Project clean-up (#320)
• Refactor #if directives
• Rename Decref/Incref to XDecref/XIncre (#275)
• Remove printing if Decref is called with NULL (#275)

Removed

• Python 2.6 support (#270)
• Python 3.2 support (#270)

Fixed

• Fixed isinstance refcount_leak (#273)
• Comparison Operators (#294)
• Improved Linux support (#300)
• Exception pickling (#286)

Known Issues

• Subclassing .NET classes (#264)
• Mixing python and .NET constructors (#252)
• Overloading on constructors, ref/out and subtypes (#265)
• pythonhome and pythonpath (#186)
• Regression bug on numpy arrays (#249)