[Python.NET] Re: [Pythonnet] Python to c# long conversion time

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Please, use myPyByteArray.GetBuffer() and the PyBuffer.Read method to copy from a NumPy array.   I created a feature request to make the default conversion mechanism take advantage of PyBuffer some time in the future.   Regards, Victor   From: Jordan GUILLOT Sent: Monday, June 27, 2022 8:19 AM To: pythonnet@python.org Subject: [Python.NET] [Pythonnet] Python to c# long conversion time   Hi,   I’m using Pythonnet to import proprietary python package from Windows Application. When my python package return a large byte array in C# world, the type conversion takes lot of time.   To illustrate this long conversion time, I made a simple example: A Python package with a method which return a byte array: class MyClass:                              @staticmethod                              def get_bytes_from_py():                                             array = np.arange(0, 720000, dtype=np.uint8)                                             return bytes(array)   An application console to call my Python package and which convert ‘bytes’ type into ‘byte[]’ type           static void Main(string[] args)         {             Runtime.PythonDLL = "c:\\Python38\\python38.dll";             PythonEngine.Initialize();                         Stopwatch st = new Stopwatch();             st.Start();               using (Py.GIL())             {                 dynamic myPackage = Py.Import("mypackage");                 dynamic myClass = myPackage.MyClass();                 dynamic myPyByteArray = myClass.get_bytes_from_py();                   long t0 = st.ElapsedMilliseconds;                 byte[] myCsharpByteArray = myPyByteArray;                 long t1 = st.ElapsedMilliseconds;                   Console.WriteLine("Conversion takes {0}ms", t1-t0);             }               st.Stop();         }   The console output: “Conversion takes 303ms”   Is this the right way for this conversion?   Environment: Python: v3.8.10 Pythonnet: Pypi: v2.5.2 Nuget : 3.0.0-preview2022-06-03 Windows 10 Pro .NET framework 4.7.2   Regards, Jordan GUILLOT

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