pythonnet 2.2.0.dev1

.Net and Mono integration for Python

Python for .NET is a package that gives Python programmers nearly seamless integration with the .NET Common Language Runtime (CLR) or Mono 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 or Mono application.

http://pythonnet.github.io/

Calling .NET code from Python

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

import clr
from System import String
from System.Collections import *

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

import clr
clr.AddReference("System.Windows.Forms")
from System.Windows.Forms import Form

Embedding Python in .NET

• 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)) 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.pi2 works, 2np.pi doesn’t

EG:

static void Main(string[] args)
{
using (Py.GIL()) {
dynamic np = Py.Import("numpy");
dynamic sin = np.sin;
Console.WriteLine(np.cos(np.pi*2));
Console.WriteLine(sin(5));
double c = np.cos(5) + sin(5);
Console.WriteLine(c);
/* this block is temporarily disabled due to regression
dynamic a = np.array(new List<float> { 1, 2, 3 });
dynamic b = np.array(new List<float> { 6, 5, 4 }, Py.kw("dtype", np.int32));
Console.WriteLine(a.dtype);
Console.WriteLine(b.dtype);
Console.WriteLine(a * b);
*/
Console.ReadKey();
}
}

outputs:

1.0
-0.958924274663
-0.6752620892
float64
int32
[ 6. 10. 12.]