Mailman 3 January 2011 - Python.NET

Problems in Installation
by Tanmoy 12 Feb '11

12 Feb '11

Hi, My name is Tanmoy and i have some problems regarding the installation of Python .NET in Ubuntu. whenever i try to follow this ( http://mail.python.org/pipermail/pythondotnet/2006-April/000474.html) i get this weird error Unhandled Exception: System.DllNotFoundException: python26 at (wrapper managed-to-native) Python.Runtime.Runtime:Py_Initialize () at Python.Runtime.Runtime.Initialize () [0x00000] in <filename unknown>:0 at Python.Runtime.PythonEngine.Initialize () [0x00000] in <filename unknown>:0 at Python.Runtime.PythonConsole.Main (System.String[] args) [0x00000] in <filename unknown>:0 Any suggestions where could i be going wrong ? Sincerely Tanmoy Mukherjee

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Operator overloading for managed objects
by Oleksii Bidiuk 08 Feb '11

08 Feb '11

Hi, did anybody have experience with using overloaded operators for managed objects? I have a class that have e.g. the operator+ overloaded in C#, but that does not seem to be picked up from the Python side. I have tried to add overloading using the setattr(MyType, "name", method_name), but it only seem to work for the native Python objects and not for the managed objects. In both cases I get "TypeError: unsupported operand type(s) for +: 'MyType' and 'MyType'". Thanks in advance! -- oleksii

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InvalidOperationException when calling a generic method on an instance
by Oleksii Bidiuk 25 Jan '11

25 Jan '11

Hi All, does anybody have experience with getting the InvalidOperationException exception when calling a generic method defined like generic <typename T> MyClass::AnotherClass<T>^ MyClass::MyMethod() { ... } When I create an instance of the MyClass and call the MyMethod() the exception mentioned above is thrown with the following stack trace: System.InvalidOperationException: Late bound operations cannot be performed on types or methods for which ContainsGenericParameters is true. at System.Reflection.RuntimeMethodInfo.ThrowNoInvokeException() at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invoke Attr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invoke Attr, Binder binder, Object[] parameters, CultureInfo culture) at Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo) in C:\...\pythonnet\src\runtime\methodbinder.cs:line 356 The MyClass is an external library which I cannot influence. Calling the MyMethod is the only way to get data access, so I cannot simply 'avoid using it'. Perhaps some additional wrapping is needed here? Ideas are highly appreciated! -- oleksii

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Python.NET and VS2001/.NET 4.0
by Oleksii Bidiuk 21 Jan '11

21 Jan '11

Hi All, I hope this will help some people like me searching for an answer. Several steps were mentioned by other people as well, but I haven't seen a step-by-step guide. It is not my intention to duplicate other posts in that sense, but rather have all-in-one post. Here is how I've got VS2010 and .NET 4.0 working with the revision 119 of the Python.NET having Python 2.6 installed. Note that the latest trunk (revision 122) gave me some problems, so I have basically reverted changes to match 119 for the time being. 1. Get the sources (tarball from sourceforge or directly from SVN) 2. Open the pythonnet.sln with VS2010 and convert to 2010 format (will happen automagically) 3. Change the target framework to 4. Follow the following step for EACH project 3.1. Right-click on the project name and select "Properties" 3.2. Select the "Application" tab on the left (if not selected yet) 3.3. Change the "Target framework" to ".NET Framework 4" 4. Open the clrmodule.il and change the lines with the version number in the following piece of code .assembly extern mscorlib { .publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) .ver 2:0:0:0 } to have .ver 4:0:0:0 5. Open the buildclrmodule.bat and change the %windir%\Microsoft.NET\Framework\v2.0.50727\ilasm /nologo /quiet /dll %ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH% to %windir%\Microsoft.NET\Framework\v4.0.30319\ilasm /nologo /quiet /dll %ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH% 5. Recompile the whole solution, ignore the deprecation warnings. Now you have all necessary files under the pythonnet folder where you have the sources. You need clr.pyd, python.exe and Python.Runtime.dll. Test Run the newly comiled python.exe Type the following >>> import System >>> print System.Environment.Version 4.0.30319.1 The last line proves that you're using hte 4.0 runtime. The precomiled binaries available from Sourceforge would show 2.0.50727.3615 This is also posted with somewhat better formatting under blog.bidiuk.com/2011/01/python-net-and-vs2010-net-4/ Comments and suggestions are welcome! -- oleksii

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Fwd: PythonNET 2.0 Alpha2 and .NET 4.0
by Oleksii Bidiuk 21 Jan '11

21 Jan '11

Hi Alla, thanks for your prompt repsonse. In Python terms String('A') means constructor with a string parameter AFAIK. When I use the python.exe build against CLR 2.0 (from pythonnet-2.0-alpha2-clr2.0_115_py26.zip) it works, but then it talks against .NET 2.0 while I want to talk to the same 4.0 version as my .NET application. With the example below using the .NET 2.0 version I get >>> s = String.__overloads__[Char, Int32]('A', 10) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: type object 'String' has no attribute '__overloads__' Basically it seems that the version of python for .net compiled against .NET 4.0 runtime does not work out of box for me. I wonder if somebody had more luck with this. 2011/1/6 Alla Gofman <Alla.Gofman(a)sandisk.com> Hi Oleksii, > > > > I have no experience with importing .net modules into Python. > > I work on embedding Python into C#. > > There is no such constructor String('A') for String class as you use, > which gets char. > > You can see which constructors exists in: > http://msdn.microsoft.com/en-us/library/system.string.string.aspx > > > > Example: > > I read in http://pythonnet.sourceforge.net/readme.html > > In most cases, Python for .NET can determine the correct constructor to > call automatically based on the arguments. In some cases, it may be > necessary to call a particular overloaded constructor, which is supported by > a special "__overloads__" attribute on a class: > > from System import String, Char, Int32 > > > > s = String.__overloads__[Char, Int32]('A', 10) > > > > I hope you succeed, > > > Alla > > > > *From:* pythondotnet-bounces+alla.gofman=sandisk.com(a)python.org [mailto: > pythondotnet-bounces+alla.gofman <pythondotnet-bounces%2Balla.gofman>= > sandisk.com(a)python.org] *On Behalf Of *Oleksii Bidiuk > *Sent:* Thursday, January 06, 2011 4:27 PM > *To:* pythondotnet(a)python.org > *Subject:* [Python.NET] PythonNET 2.0 Alpha2 and .NET 4.0 > > > > Hi, > > > > I am trying to use Python for .NET under VS2010 and .NET 4.0. I've > downloaded the pythonnet-2.0-alpha2.zip and changed the project settings to > use .NET 4.0 under VS2010 and recompiled everything. The resulting > python.exe can be run, and statements like "import clr" and "from System > import String" work (as the Python standard library calls as well) until I > try to instantiate a class as e.g. > > > > s = String('A') > > At this moment the Python for .NET seem to crash in nativecall.cs at > NativeCall.Call_3() at (the only) line > > > > return Impl.Call_3(fp, a1, a2, a3); > > > > with dreaded "Exception of type 'System.ExecutionEngineException' was > thrown.". Trying to instantiate Int32() object results in "Attempted to read > or write protected memory. This is often an indication that other memory is > corrupt." > > > > Suggestions are more than welcome! Thanks in advance! > -- > oleksii > > ------------------------------ > 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). > > -- oleksii -- oleksii

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PythonDotNet - IronPyton
by Emmanuel Lambert 10 Jan '11

10 Jan '11

Dear all, I was wondering : what is the difference between PythonDotNet and IronPython? It looks like IronPython is rapidly becoming a maturing implementation for the .NET platform, with also a plugin for Visual Studio becoming available : http://ironpython.net/ The distinction between the two implementations, future roadmaps, etc, is not clear to me. Any comments are welcome... regards Emmanuel

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PythonNET 2.0 Alpha2 and .NET 4.0
by Oleksii Bidiuk 06 Jan '11

06 Jan '11

Hi, I am trying to use Python for .NET under VS2010 and .NET 4.0. I've downloaded the pythonnet-2.0-alpha2.zip and changed the project settings to use .NET 4.0 under VS2010 and recompiled everything. The resulting python.exe can be run, and statements like "import clr" and "from System import String" work (as the Python standard library calls as well) until I try to instantiate a class as e.g. s = String('A') At this moment the Python for .NET seem to crash in nativecall.cs at NativeCall.Call_3() at (the only) line return Impl.Call_3(fp, a1, a2, a3); with dreaded "Exception of type 'System.ExecutionEngineException' was thrown.". Trying to instantiate Int32() object results in "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Suggestions are more than welcome! Thanks in advance! -- oleksii

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