Mailman 3 December 2010 - Python.NET

getting started - can't import a simple dll
by Jason Awbrey Dec. 22, 2010

Dec. 22, 2010

I'm evaluating PDN for use in an upcoming project. 1. installed Python 2.6.5 2. installed PDN - copied the clr.pyd file to Python's DLLs folder, and copied Python.Runtime.dll to Python's root 3. copy my dll (VS2010, simple C# class lib with two methods) into Python's root. 4. start python (using the python.exe from 2.6.5, not the one from PDN) >>> import clr >>> clr.AddReference("My.DLL") Traceback (most recent call last): File "<stdin>", line 1, in <module> System.IO.FileNotFoundException: Unable to find assembly 'HFF.Helper.Utilities'. at Python.Runtime.CLRModule.AddReference(String name) >>> I assume I'm making some incredibly obvious newbie error. Can anyone point me in the right direction? And, where can I find good docs/reference/discussion on using PDN? thanks - Jason

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building on linux, mono 2.8.1
by Laszlo Sebo Dec. 16, 2010

Dec. 16, 2010

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Re: [Python.NET] Python for .NET installation problem
by Alla Gofman Dec. 6, 2010

Dec. 6, 2010

Hi Barton, Thanks. I also have build a Release version of pythonnet.sln. However, I ran into some trouble, Python.exe didn't launched. I get the same error as before for both python25 and 26 when I run my program and pythonnet.sln. I don't understand how can I use python.exe I want to run C# which embedding Phyton without installing Python full version on PC. Can I do so? Alla. From: Barton [mailto:barton@bcdesignswell.com] Sent: Friday, December 03, 2010 10:06 AM To: Alla Gofman Subject: Re: [Python.NET] Python for .NET installation problem Hi, alla, I'll push these to the project in a bit. I did goof on the last round. Cheers, Barton On 12/1/2010 7:48 AM, Alla Gofman wrote: Hi, I have installed Python v. 264 on Win7 and I want to install Python for .NET. I downloaded pythonnet-2.0-alpha2-clr2.0_py26 but there is no python.exe file there. So I downloaded pythonnet-2.0-alpha2-clr2.0_py25 where file indeed exists. I follow the instruction for installation on http://pythonnet.sourceforge.net/readme.html#installation "The source release is a self-contained "private" assembly. Just unzip the package wherever you want it, cd to that directory and run python.exe to start using it." I run python.exe and I get an error: Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'python25': The specified module could not be found. (Exception from HRESULT: 0x8007007E) at Python.Runtime.Runtime.Py_Initialize() at Python.Runtime.Runtime.Initialize() at Python.Runtime.PythonEngine.Initialize() at Python.Runtime.PythonConsole.Main(String[] args) Am I doing something wrong? Thanks. AllaG ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies). _________________________________________________ Python.NET mailing list - PythonDotNet(a)python.org<mailto:PythonDotNet@python.org> http://mail.python.org/mailman/listinfo/pythondotnet

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[Python.Net] AcquireLock deadlock while calling Python from C#
by Benjamin Aranguren Dec. 5, 2010

Dec. 5, 2010

@Julien I have been calling Python from C# without any problems even in a multi-threaded setup. I am using .Net 2.0 and Python 2.5. Main difference, at least from what I don't see in your code, is I also call BeginAllowThreads() after Initialize(). This allows me to initialize PythonEngine in a different thread once and never have to worry about it again. I remember having similar problem when I first embedded Python and this doc helped me come up with this solution. http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpre… BTW, AcquireLock() below always returns 1. Please let me know if this helps. /* This is in main thread */ if (!PythonEngine.IsInitialized) { PythonEngine.Initialize(); PythonEngine.BeginAllowThreads(); } /* This is ran in another thread */ IntPtr gs = PythonEngine.AcquireLock(); PyObject module = PythonEngine.ImportModule(pymodule); try { PyObject res = module.InvokeMethod(method_name, _args); /* Python calls here */ .... } catch (PythonException pe) { /* Handle python exceptions */ } finally { PythonEngine.ReleaseLock(gs); }

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[Python.Net] AcquireLock deadlock while calling Python from C#
by AwareMan Dec. 3, 2010

Dec. 3, 2010

Hi, sorry for the two posts, i was not sure if the mailing list server would let the first one be sent as this address wasn't registered :x I finally managed to solve the issue, and I'm a bit ashamed of the trivialness of the solution but well, it may help someone someday. The difference between the two executions was that as calculation is higly parallelized, the BeginAllowThread() method had to be called at start... Thought that using AcquireLock and ReleaseLock would be enough in order to ensure thread safety, but that's not the case. Also, EndAllowThread has to be called when stopping to use the PythonEngine, not on a perrequest basis. Now, this is working just great :) Best regards, Julien

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[Python.Net] AcquireLock deadlock while calling Python from C#
by Julien faixo Dec. 2, 2010

Dec. 2, 2010

Hi, sorry for the two posts, i was not sure if the mailing list server would let the first one be sent as this address wasn't registered :x I finally managed to solve the issue, and I'm a bit ashamed of the trivialness of the solution but well, it may help someone someday. The difference between the two executions was that as calculation is higly parallelized, the BeginAllowThread() method had to be called at start... Now, this is working just great :) Best regards, Julien

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Python for .NET installation problem
by Alla Gofman Dec. 2, 2010

Dec. 2, 2010

Hi, I have installed Python v. 264 on Win7 and I want to install Python for .NET. I downloaded pythonnet-2.0-alpha2-clr2.0_py26 but there is no python.exe file there. So I downloaded pythonnet-2.0-alpha2-clr2.0_py25 where file indeed exists. I follow the instruction for installation on http://pythonnet.sourceforge.net/readme.html#installation "The source release is a self-contained "private" assembly. Just unzip the package wherever you want it, cd to that directory and run python.exe to start using it." I run python.exe and I get an error: Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'python25': The specified module could not be found. (Exception from HRESULT: 0x8007007E) at Python.Runtime.Runtime.Py_Initialize() at Python.Runtime.Runtime.Initialize() at Python.Runtime.PythonEngine.Initialize() at Python.Runtime.PythonConsole.Main(String[] args) Am I doing something wrong? Thanks. AllaG ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies).

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[Python.Net] AcquireLock deadlock while calling Python from C#
by AwareMan Dec. 1, 2010

Dec. 1, 2010

Hi, As Python offers better scientific computing libraries, I wish to reate a bridge between Python and C#. Numpy and matplotlib being some modules needed, I choosed Python.Net rather than IronPython in order to make this work (I'm aware of the existence of IronClad, but unfortunately it seems not to be fully compatible with matplotlib and numpy...). Using Python.Net, I've been quite quickly able to launch Python scripts with parameters, and get back script outputs in C#. That's pretty amazing, and before poiting out my problem, I'd like to thank all the Python.Net staff, that's a really nice project :) Now, let's talk dirty: my problem is as I said I'm able to launch python script, but this can happen only once. I am using AcquireLock and ReleaseLock as explained on various websites, but AcquireLock returns in IntPtr containing "0" (is it a bug ?), and on the second call to AcquireLock, that's it baby, a deadlock :( PythonEngine.Initialize() has been previously called, and is called only once. I'm using .Net 2.0, and this issue looks exactly like this one<http://www.mail-archive.com/pythondotnet@python.org/msg00299.html>that is 4 years old *sic* Below, the piece of code called twice. IntPtr gs = PythonEngine.AcquireLock(); > try > { > PyObject module = PythonEngine.ImportModule(moduleName); > PyObject method = module.GetAttr("Invoke"); > PyObject[] items = new PyObject[parameters.Length]; > for (int i = 0; i < parameters.Length; ++i) > items[i] = ToPython(parameters[i]); > > PyObject pythonReturnValue = method.Invoke(new > PyTuple(items)); > > Object[] result; > if (pythonReturnValue.Length() > 0) > { > result = new Object[pythonReturnValue.Length()]; > for (int i = 0; i < pythonReturnValue.Length(); ++i) > result[i] = > pythonReturnValue.GetItem(i).AsManagedObject(typeof(double)); > } > else > { > result = new Object[1]; > result[0] = > pythonReturnValue.AsManagedObject(typeof(double)); > } > > module.Dispose(); > pythonReturnValue.Dispose(); > foreach (PyObject item in items) > item.Dispose(); > > return result; > } > finally > { > PythonEngine.ReleaseLock(gs); > } > Is there something I may have done wrong ? Thanks for your help, Julien

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[Python.Net] AcquireLock deadlock while calling Python from C#
by Julien faixo Dec. 1, 2010

Dec. 1, 2010

Hi, As Python offers better scientific computing libraries, I wish to reate a bridge between Python and C#. Numpy and matplotlib being some modules needed, I choosed Python.Net rather than IronPython in order to make this work (I'm aware of the existence of IronClad, but unfortunately it seems not to be fully compatible with matplotlib and numpy...). Using Python.Net, I've been quite quickly able to launch Python scripts with parameters, and get back script outputs in C#. That's pretty amazing, and before poiting out my problem, I'd like to thank all the Python.Net staff, that's a really nice project :) Now, let's talk dirty: my problem is as I said I'm able to launch python script, but this can happen only once. I am using AcquireLock and ReleaseLock as explained on various websites, but AcquireLock returns in IntPtr containing "0" (is it a bug ?), and on the second call to AcquireLock, that's it baby, a deadlock :( PythonEngine.Initialize() has been previously called, and is called only once. I'm using .Net 2.0, and this issue looks exactly like this one<http://www.mail-archive.com/pythondotnet@python.org/msg00299.html>that is 4 years old *sic* Below, the piece of code called twice. IntPtr gs = PythonEngine.AcquireLock(); > try > { > PyObject module = PythonEngine.ImportModule(moduleName); > PyObject method = module.GetAttr("Invoke"); > PyObject[] items = new PyObject[parameters.Length]; > for (int i = 0; i < parameters.Length; ++i) > items[i] = ToPython(parameters[i]); > > PyObject pythonReturnValue = method.Invoke(new > PyTuple(items)); > > Object[] result; > if (pythonReturnValue.Length() > 0) > { > result = new Object[pythonReturnValue.Length()]; > for (int i = 0; i < pythonReturnValue.Length(); ++i) > result[i] = > pythonReturnValue.GetItem(i).AsManagedObject(typeof(double)); > } > else > { > result = new Object[1]; > result[0] = > pythonReturnValue.AsManagedObject(typeof(double)); > } > > module.Dispose(); > pythonReturnValue.Dispose(); > foreach (PyObject item in items) > item.Dispose(); > > return result; > } > finally > { > PythonEngine.ReleaseLock(gs); > } > Is there something I may have done wrong ? Thanks for your help, Julien

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