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Python.NET is a package that gives Python programmers nearlyseamless integration with the .NET Common Language Runtime (CLR) andprovides a powerful application scripting tool for .NET developers. Itallows Python code to interact with the CLR, and may also be used toembed Python into a .NET application.

Python.NET allows CLR namespaces to be treated essentially as Python packages.

importclrfromSystemimportStringfromSystem.Collectionsimport*

To load an assembly, use theAddReference function in theclrmodule:

importclrclr.AddReference("System.Windows.Forms")fromSystem.Windows.FormsimportForm

• You must setRuntime.PythonDLL property orPYTHONNET_PYDLL environment variablestarting with version 3.0, otherwise you will receiveBadPythonDllException(internal, derived fromMissingMethodException) upon callingInitialize.Typical values arepython38.dll (Windows),libpython3.8.dylib (Mac),libpython3.8.so (most other Unix-like operating systems).
• Then callPythonEngine.Initialize(). If you plan to use Python objects frommultiple threads, also callPythonEngine.BeginAllowThreads().
• All calls to python should be inside ausing (Py.GIL()) {/* Your code here */} block.
• Import python modules usingdynamic mod = Py.Import("mod"), thenyou can call functions as normal, egmod.func(args).
• Usemod.func(args, Py.kw("keywordargname", keywordargvalue)) ormod.func(args, keywordargname: keywordargvalue) to apply keywordarguments.
• All python objects should be declared asdynamic type.
• Mathematical operations involving python and literal/managed typesmust have the python object first, eg.np.pi * 2 works,2 * np.pi doesn't.

staticvoidMain(string[]args){PythonEngine.Initialize();using(Py.GIL()){dynamicnp=Py.Import("numpy");Console.WriteLine(np.cos(np.pi*2));dynamicsin=np.sin;Console.WriteLine(sin(5));doublec=(double)(np.cos(5)+sin(5));Console.WriteLine(c);dynamica=np.array(newList<float>{1,2,3});Console.WriteLine(a.dtype);dynamicb=np.array(newList<float>{6,5,4},dtype:np.int32);Console.WriteLine(b.dtype);Console.WriteLine(a*b);Console.ReadKey();}}

Output:

1.0-0.958924274663-0.6752620892float64int32[6.10.12.]

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

https://github.com/pythonnet/pythonnet/wiki

Mailing list

https://mail.python.org/mailman/listinfo/pythondotnet

Chat

https://gitter.im/pythonnet/pythonnet

This project is supported by the.NET Foundation.