Denis, Thank you for your reply! 1. I did use simplified version at the very beginning. Just for debug purpose, I converted it to the explicit one. 2. UI and unit test actually access the same block of code, as pasted in my original email. 3. After trying to force the python interpreter shutdown, by calling Runtime.Py_Finalize()in PythonEngine.Initialize(), I got an exception thrown by a service used by the UI. So it is that service, which is not written by me, that starts up python interpreter. Now the problem has nothing to do with PythonNet interface. Regards, Jian

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Message: 1 Date: Thu, 28 Jul 2016 14:42:25 -0500 From: Denis Akhiyarov <denis.akhiyarov@gmail.com> To: "A list for users and developers of Python for .NET" <pythondotnet@python.org> Subject: Re: [Python.NET] PythonEngine partially initialized? Message-ID: <CALxxJLQjt7yN5sPLN9qhVx_yLer2DbokFNYdw-_UQBz3Q= vKVg@mail.gmail.com> Content-Type: text/plain; charset="utf-8"

1. Jian, can you convert your code to simplified interface using Py.GIL() calls? If not possible, please let us know why.

https://github.com/pythonnet/pythonnet/blob/master/README.md

2. Your first code sample (unit test) is self-contained, but in second code sample (UI) it is not clear where you acquire and release the GIL?

3. Finally can you post this as an issue on github?

https://github.com/pythonnet/pythonnet/issues/new

Thanks, Denis

On Thu, Jul 28, 2016 at 8:51 AM, Jian Wang <wjchicago@gmail.com> wrote:

...

Dear PythonNet group,

I am working on a c# project which would like to access functions written in python from time to time. Below is a wrapper function.

I have a unittest setup for this function. Everytime I run this unittest, it will get information from python world as I desired.

public ScriptContext GetContextFromScript() { ScriptContext scriptContext; try { if (!PythonEngine.IsInitialized) PythonEngine.Initialize(); var threadState = PythonEngine.BeginAllowThreads(); var gilState = PythonEngine.AcquireLock();

PyObject mod = PythonEngine.ImportModule(this.GetModuleName()); PyObject instance = mod.InvokeMethod("Strategy", new PyTuple()); scriptContext =(ScriptContext)instance.InvokeMethod("SetContext", new PyTuple()).AsManagedObject(typeof (ScriptContext));

PythonEngine.ReleaseLock(gilState); PythonEngine.EndAllowThreads(threadState); PythonEngine.Shutdown(); } catch (Exception ex) { throw; } return scriptContext; }

However, when I launch the UI and call this function by clicking some button, the program hangs at PythonEngine.Initialize().

After debugging into the PythonNet source code, I found when calling through UI, the RunTime.Initialize() will return true for Runtime.Py_IsInitialized().

internal static void Initialize() { is32bit = IntPtr.Size == 4;

if (0 == Runtime.Py_IsInitialized()) { Runtime.Py_Initialize(); }

if (0 == Runtime.PyEval_ThreadsInitialized()) { Runtime.PyEval_InitThreads(); } }

And the whole initialize process will hang when result.Dispose() is called. It actually trying to acquire lock but cannot get it.

using (StreamReader reader = new StreamReader(stream)) { // add the contents of clr.py to the module string clr_py = reader.ReadToEnd(); PyObject result = RunString(clr_py, module_globals, locals.Handle); if (null == result) throw new PythonException(); result.Dispose(); }

It looks like something happend before code reaching this pythong wrapper function. PythonEninge is partially initialized with Runtime.Py_IsInitialized() = true and Runtime.PyEval_ThreadsInitialized() = false.

Questions 1. what could be the possible cause for this situation? 2. If I cannot find the root cause and put BegineAllowThreads() there, what could be a solution for it?

Many thanks!

Jian

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