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.Net and Mono integration for Python

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Python for .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.

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.pi_2 works, 2_np.pi doesn’t.

Example

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();
    }
}

Output:

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

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