jaredbroad/QuantConnect.pythonnetv2.0.21

pythonnet is a package that gives .NET programmers ability to integrate Python engine and use Python libraries.

Embedding Python in .NET

• You must set Runtime.PythonDLL property or PYTHONNET_PYDLL environment variable, 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 *nix). Full path may be required.
• 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). You can also access Python objects via PyObject and dervied types instead of using dynamic.
• Use mod.func(args, Py.kw("keywordargname", keywordargvalue)) or mod.func(args, keywordargname: keywordargvalue) to apply keyword arguments.
• 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

using var _ = 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:

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: