Python.NET is a package that gives Python programmers nearly seamless integration with the .NET Common Language Runtime (CLR) and provides a powerful application scripting tool for .NET developers. It allows Python code to interact with the CLR, and may also be used to embed Python into a .NET application.

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

importclrfromSystemimportStringfromSystem.Collectionsimport*

To load an assembly, use the AddReference function in the clr module:

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

• You must set Runtime.PythonDLL property or PYTHONNET_PYDLL environment variable starting with version 3.0, otherwise you will receive BadPythonDllException (internal, derived from MissingMethodException) upon calling Initialize. Typical values are python38.dll (Windows), libpython3.8.dylib (Mac), libpython3.8.so (most other Unix-like operating systems).
• 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).
• Use mod.func(args, Py.kw("keywordargname", keywordargvalue)) or mod.func(args, keywordargname: keywordargvalue) to apply keyword arguments.
• All python objects should be declared as dynamic type.
• Mathematical operations involving python and literal/managed types must 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:

1.0-0.958924274663-0.6752620892 float64 int32 [6.10.12.]

Information on installation, FAQ, troubleshooting, debugging, and projects 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.