pythonnet 3.0.1

.NET Standard 2.0
There is a newer prerelease version of this package available.
See the version list below for details.
dotnet add package pythonnet --version 3.0.1
NuGet\Install-Package pythonnet -Version 3.0.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="pythonnet" Version="3.0.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add pythonnet --version 3.0.1
#r "nuget: pythonnet, 3.0.1"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install pythonnet as a Cake Addin
#addin nuget:?package=pythonnet&version=3.0.1

// Install pythonnet as a Cake Tool
#tool nuget:?package=pythonnet&version=3.0.1

pythonnet is a package that gives .NET programmers ability to integrate Python engine and use Python libraries.

Embedding Python in .NET

  • You must set Runtime.PythonDLL property or PYTHONNET_PYDLL environment variable, otherwise you will receive BadPythonDllException (internal, derived from MissingMethodException) upon calling Initialize. Typical values are python38.dll (Windows), libpython3.8.dylib (Mac), (most other *nix). Full path may be required.
  • Then call PythonEngine.Initialize(). If you plan to use Python objects from multiple threads, also call PythonEngine.BeginAllowThreads().
  • All calls to Python should be inside a using (Py.GIL()) {/* Your code here */} block.
  • Import python modules using dynamic mod = Py.Import("mod"), then you can call functions as normal, eg mod.func(args). You can also access Python objects via PyObject and dervied types instead of using dynamic.
  • Use mod.func(args,"keywordargname", keywordargvalue)) or mod.func(args, keywordargname: keywordargvalue) to apply keyword arguments.
  • Mathematical operations involving python and literal/managed types must have the python object first, eg. np.pi * 2 works, 2 * np.pi doesn't.


using var _ = Py.GIL();

dynamic np = Py.Import("numpy");
Console.WriteLine(np.cos(np.pi * 2));

dynamic sin = np.sin;

double c = (double)(np.cos(5) + sin(5));

dynamic a = np.array(new List<float> { 1, 2, 3 });

dynamic b = np.array(new List<float> { 6, 5, 4 }, dtype: np.int32);

Console.WriteLine(a * b);


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Information on installation, FAQ, troubleshooting, debugging, and projects using pythonnet can be found in the Wiki:

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.NET Foundation

This project is supported by the .NET Foundation.

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
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Learn more about Target Frameworks and .NET Standard.

NuGet packages (17)

Showing the top 5 NuGet packages that depend on pythonnet:

Package Downloads

Python.Included is an automatic deployment mechanism for .NET packages which depend on the embedded Python distribution. This allows libraries depending on Python and/or Python packages to be deployed via Nuget without having to worry about any local Python installations.


Core runtime components for Gradient


.NET bindings for NumPy. Requires the actual Python with NumPy installed.

Alternet.Studio.Scripter.Python The ID prefix of this package has been reserved for one of the owners of this package by

AlterNET Scripter for Python.


FULL TensorFlow 2.5+ for .NET with Keras. Build, train, checkpoint, execute models. Samples:,, Deep learning with .NET blog: Comparison with TensorFlowSharp: Comparison with TensorFlow.NET: Allows building arbitrary machine learning models, training them, and loading and executing pre-trained models using the most popular machine learning framework out there: TensorFlow. All from your favorite comfy .NET language. Supports both CPU and GPU training (the later requires CUDA or a special build of TensorFlow). Provides access to full tf.keras, estimators and many more APIs. Free for non-commercial use. For licensing options see !!NOTE!! This version requires Python 3.x x64 to be installed with TensorFlow 2.5.x. See the official installation instructions in (ensure you are installing version 2.5 to avoid hard-to-debug issues). Please, report any issues to For community support use with tags (must be all 3 together) tensorflow, gradient, and .net. For support email . More information in NuGet package release notes and on the project web page: . TensorFlow, the TensorFlow logo and any related marks are trademarks of Google Inc.

GitHub repositories (2)

Showing the top 2 popular GitHub repositories that depend on pythonnet:

Repository Stars
A Python.NET based framework enabling .NET libraries to call into Python packages without depending on a local Python installation.
.Net Ledger: Double-Entry Accounting System
Version Downloads Last updated
3.1.0-preview2023-01-03 208 1/3/2023
3.0.1 13,168 11/2/2022
3.0.0 4,453 9/29/2022
2.3.0-py35-dotnet 3,363 3/16/2017
2.3.0-py27-dotnet 1,732 3/16/2017