10000 PythonEngine.PythonHome doesn't work · Issue #708 · pythonnet/pythonnet · GitHub
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fandrei opened this issue Jul 28, 2018 · 8 comments
Closed

PythonEngine.PythonHome doesn't work #708

fandrei opened this issue Jul 28, 2018 · 8 comments

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@fandrei
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fandrei commented Jul 28, 2018

Environment

Pythonnet version: 2.3.0
Python version: 3.6
Operating System: Windows 7 x64

Details

Trying to run this C# program:

			var pythonPath = @"C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python36_64\";

			PythonEngine.PythonHome = pythonPath;

			using (Py.GIL())
			{
				dynamic np = Py.Import("numpy");
				Console.WriteLine(np.cos(np.pi * 2));
			}

and getting this exception:

System.DllNotFoundException: 'Unable to load DLL 'python36': The specified module could not be found. (Exception from HRESULT: 0x8007007E)'
@den-run-ai
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Please read this comment from the issue linked in the wiki:

#259 (comment)

@fandrei
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fandrei commented Jul 28, 2018

@denfromufa it's a workaround; and that still means that PythonEngine.PythonHome doesn't work, does it?

@den-run-ai
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Please refer to official CPython embedding API if you think that this behavior is not correct and then contributions are welcome!

@fandrei
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fandrei commented Jul 28, 2018

@denfromufa I'm already contributing by testing your code.

Well, this workaround doesn't work properly too:

			var pythonPath = @"C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python3_64";

			Environment.SetEnvironmentVariable("PATH", $@"{pythonPath};" + Environment.GetEnvironmentVariable("PATH"));
			Environment.SetEnvironmentVariable("PYTHONHOME", pythonPath);
			Environment.SetEnvironmentVariable("PYTHONPATH ", $@"{pythonPath}\Lib");

			using (Py.GIL())
			{
				dynamic np = Py.Import("numpy");
				Console.WriteLine(np.cos(np.pi * 2));
			}

System.DllNotFoundException: 'Unable to load DLL 'python36': The specified module could not be found. (Exception from HRESULT: 0x8007007E)'

The DLL file does exist at the specified path.

C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64>attrib python36.dll
A            C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\python36.dll

@den-run-ai
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Are you mixing two different Python installations Python3_64 and Anaconda3_64?!

@fandrei
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fandrei commented Jul 28, 2018 •
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@denfromufa in this sample, only one installation is used. The path C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python3_64 is correct and C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python36_64\python36.dll does exist.

@fandrei
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fandrei commented Jul 28, 2018 •
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Ah, now I see. My bad. PATH workaround works, PythonEngine.PythonHome throws an exception.

@epignatelli
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epignatelli commented Jul 9, 2020 •
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Would it be better to reopen this issue?

The only solution is actually a workaround. Also, why is PythonEngine.PythonPath = "" not working?
Any plan to fix it?

Or any place I can start looking at to fix it?

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@fandrei @den-run-ai @epignatelli
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