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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.
.. code-block:: python
import clr from System import String from System.Collections import *
To load an assembly, use the AddReference
function in the clr
module:
.. code-block:: python
import clr clr.AddReference("System.Windows.Forms") from System.Windows.Forms import Form
By default, Mono will be used on Linux and macOS, .NET Framework on Windows. For details on the loading of different runtimes, please refer to the documentation.
.NET Core
If .NET Core is installed in a default location or the ``dotnet`` CLI tool is on
the ``PATH``, loading it instead of the default (Mono/.NET Framework) runtime
just requires setting either the environment variable
``PYTHONNET_RUNTIME=coreclr`` or calling ``pythonnet.load`` explicitly:
.. code-block:: python
from pythonnet import load
load("coreclr")
import clr
Embedding Python in .NET
------------------------
- 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).
- 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)``.
- 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.
Example
~~~~~~~
.. code-block:: csharp
static void Main(string[] args)
{
PythonEngine.Initialize();
using (Py.GIL())
{
dynamic np = Py.Import("numpy");
Console.WriteLine(np.cos(np.pi * 2));
dynamic sin = np.sin;
Console.WriteLine(sin(5));
double c = (double)(np.cos(5) + sin(5));
Console.WriteLine(c);
dynamic a = np.array(new List<float> { 1, 2, 3 });
Console.WriteLine(a.dtype);
dynamic b = np.array(new List<float> { 6, 5, 4 }, dtype: np.int32);
Console.WriteLine(b.dtype);
Console.WriteLine(a * b);
Console.ReadKey();
}
}
Output:
.. code:: csharp
1.0
-0.958924274663
-0.6752620892
float64
int32
[ 6. 10. 12.]
Resources
---------
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
.NET Foundation
---------------
This project is supported by the `.NET Foundation <https://dotnetfoundation.org>`_.
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:target: https://anaconda.org/conda-forge/pythonnet
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.. |nuget release shield| image:: https://img.shields.io/nuget/v/pythonnet
:target: https://www.nuget.org/packages/pythonnet/
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:target: https://github.com/pythonnet/pythonnet/actions?query=branch%3Amaster
FAQs
.NET and Mono integration for Python
We found that pythonnet demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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