Mailman 3 July 2016 - Python.NET

PythonNet on Cygwin
by Nikhil Garg 21 Jun '17

21 Jun '17

Hi Guys, I was wondering if anyone knows how to make Python for .Net work on cygwin installation of python. I have been looking around and find a mixed bag of information. If anyone knows of the working version of Python for .Net and its dependency, I would appreciate if you could share it with me. Currently, I am using a generic windows version and it works just fine, but I need it to work on Cygwin version of python. I appreciate any helpful replies. Thanks, Nikhil

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cx_freeze and python.net
by Boris Burdin 22 May '17

22 May '17

Hello everybody, I'm trying to build a python.net application using cx-freeze . Once the application is built, I put in my final folder the Python.Runtime.dll. but it stil doesn't seem to work . Actually, when I run the .exe file, nothing is happening. So, I wonder if there were something else to do, another dll to put in the folder, or any option to use with cx_freeze when building the application ? i would be very grateful if you could help me on this matter .. Thanks in advance, Boris

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upcoming talk about pythonnet at PyOhio
by Denis Akhiyarov 14 Sep '16

14 Sep '16

http://pyohio.org/schedule/presentation/240/ Saturday 10:30 a.m.–11:20 a.m.Integrating Python into the CLR with Python for .NETHussein Farran <http://pyohio.org/speaker/profile/269/>Audience level:IntermediateDescription Python for .NET is a project dedicated to being able to call into Python from the CLR. Where IronPython has fallen off as the .NET Python prodigal son Python for .NET has picked up the slack. Python for .NET (or pythonnet for short) is an integration of the C Python engine with .NET. We'll be going through the uses and methods of integration of Python with your .NET projects. Abstract This talk covers embedding Python into the .NET runtime as well as running Python from your .NET code. It will be in C# on the .NET side. It will cover topics such as embedding Python, purposes for scripting, script security, and script/embedded code speeds. I will also cover IronPython and provide a comparison and analysis of how it compares with Python for .NET. This may include talking notes about the implementation of IronPython as well as benchmark comparisons. Hussein Farran Hussein Farran is relatively new to the professional IT world, but he’s doing his best to come in blazing. While building his experience Hussein strives to forge connections with those more experienced and to pass on what he knows to those less experienced. As a Software Developer at UseTech Design, Hussein has the opportunity to dip into many project types and to learn from a varied cast of co-workers and mentors.

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pythonnet appdomain(s)
by Adam Klein 07 Sep '16

07 Sep '16

Hello, Is there a design reason that pythonnet loads C# assemblies into its own AppDomain rather than establishing a separate AppDomain? It would be useful for instance when developing in C# in parallel with writing python code (say, in the ipython REPL) to be able to reload C# assemblies dynamically. Also, we've found it useful in Initialize() to enable shadow copying, to prevent file locking, ie internal static void Initialize() { ... AppDomain domain = AppDomain.CurrentDomain; // prevent file locking domain.SetShadowCopyFiles(); domain.SetShadowCopyPath(null); Although these are deprecated methods, and really it should be establishing a new AppDomain as above. Regards, Adam _________________________________ Adam D Klein BlueMountain Capital Management LLC 280 Park Ave, 5th Floor East New York, NY 10017 O:(212)905-2136 C:(917)331-8871

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"Incorrect" behavior of inheriting from class which is inherited from .Net class
by Hansong Huang 26 Aug '16

26 Aug '16

Hello, This is related to previous investigation of inheriting from .NET interface class to create WPF MVVM structure. As now I believe it has nothing to do with interface class, but instead caused by inheriting from .Net class overall. please see the following code import clr, Systemclass baseNA(System.Random): __namespace__ = "BaseNA" def __init__(self): super(baseNA,self).__init__()# @clr.clrmethod(System.String,[]) def ToString(self): return "string" class baseNB(baseNA): __namespace__ = "BaseNB" def __init__(self): super(baseNB,self).__init__()bna = baseNA()print bna.ToString()print bna._Random__ToString()bnb = baseNB()print bnb.ToString()print bnb._baseNA__ToString()print bnb._Random__ToString() This produces the following outputstringBaseNA.baseNABaseNB.baseNBBaseNB.baseNBBaseNB.baseNB as you see, while baseNA -- the first level inherited class works fine. ToString() overrides System.Random.ToString() But baseNB inherited from baseNA did not inherit ToString() method from baseNA, but rather inherited from System.Random. Not sure if it is a bug in python.net or was intended. regards, Hansong

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Re: [Python.NET] PythonEngine partially initialized?
by Jian Wang 30 Jul '16

30 Jul '16

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 > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 28 Jul 2016 14:42:25 -0500 > From: Denis Akhiyarov <denis.akhiyarov(a)gmail.com> > To: "A list for users and developers of Python for .NET" > <pythondotnet(a)python.org> > Subject: Re: [Python.NET] PythonEngine partially initialized? > Message-ID: > <CALxxJLQjt7yN5sPLN9qhVx_yLer2DbokFNYdw-_UQBz3Q= > vKVg(a)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(a)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 > > > > _________________________________________________ > > Python.NET mailing list - PythonDotNet(a)python.org > > https://mail.python.org/mailman/listinfo/pythondotnet > > >

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PythonEngine partially initialized?
by Jian Wang 29 Jul '16

29 Jul '16

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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Debugging .NET assembly from Python 3
by Pochon-Guérin Ludovic 20 Jul '16

20 Jul '16

Hi, Using Visual Studio 2015, I have a Python project and a C# DLL project. >From the Python code, I import and call functions from the C# class. When running in Debug, I am able to stop at breakpoints in the Python code, but not in the C# code. The debugger jumps over the calls as if no symbols were loaded. I would like to know if it is possible to stop at breakpoints in the C# code and how to setup it in Visual Studio. This feature works when using IronPython, but we want to use PythonDotNet from Miniconda3. Thanks Ludovic

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clr ImportError
by Daniel Fernandez 17 Jul '16

17 Jul '16

Hi All, I was wondering if anyone has ran into this before. I have latest pythonnet installed and everything is working great. I have been using for the last couple of weeks with python 3.5.2 (32 bit) on Win 7 box. I decided to try out ptpython so I pip install it. Now I am getting a "ImportError: dynamic module does not define module export function (PyInit_clr)" error. I go back to the normal python repl window and the same error occurs. Has anyone seen this before and what's the best way to debug this? Thanks. Danny

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