Mailman 3 - Python.NET

Embedding: finer control over module creation
by Tom Unger 26 Apr '18

26 Apr '18

I'm starting on a project to embed CPython into a .NET application for scripting. The application currently uses IronPython, which is falling behind. Our scripting needs are fairly extensive and I'm challenged by the limited information I find available. First questions are about some finer grain control over First, my application loads a number of scripts. I currently use PythonEngine.ModuleFromString() and this works but I would like finer control. 1. Set the filename in call to Py_CompileString(). Current this is set to "none" 2. Set globals for module before executing it. I put certain values in the scripts global space for convenience. PythonEngine.Compile() will compile the code but then I don't see any way to execute the code. Runtime.PyImport_ExecCodeModule(name, c); is not public. Is there a way to do this with the current API? If I fork the GIT repo, make changes that I need, are they likely to be incorporated? Thanks, Tom

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AddReferenceToFileAndName, AddReferenceToFile
by Joe 20 Apr '18

20 Apr '18

Hello, I found lots of references to AddReferenceToFileAndName and AddReferenceToFile online but could not find anything on them in the docs. Have they been removed? I looked at pythonnet/src/runtime/moduleobject.cs and there is only a single function public static Assembly AddReference(string name) which seems to handle all the cases. Kind regards, Joe

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Getting handles to .NET objects, un-referencing modules
by Joe 20 Apr '18

20 Apr '18

Hello, I have a .cs file that contains public struct SomeStruct { .... } public static class SomeClass { .... } So far I use it with PythonNET like import clr clr.AddReference('c:\\Test\Module.dll') from Module import SomeClass, SomeStruct SomeClass.SomeMethod(...) My problem is now that I need to work with dlls with identical names and no version number set, so PythonNET will not see them as two different dlls but as the same. Even if I import them using the full path with AddReference. Now I would like to use them as stated here https://stackoverflow.com/questions/31408391/python-for-net-using-same-net-… like x = clr.AddReference('c:\\Test\Module.dll') But how would I get the handle to SomeClass and SomeStruct ? Another way would be to un-reference the dlls after each use, as described here https://stackoverflow.com/questions/1362114/how-to-unload-a-net-assembly-re… How would that syntax look like? Kind regards, Joe

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Garbage collector with Pyhton using PyhtonForNet
by techi eth 20 Apr '18

20 Apr '18

I would like to know how the data structure of C# dll defined in python will get cleared from system memory. Any link or detail will be helpful to understand memory leak cased when using dotnet with python.

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How to use C# object[] in python
by techi eth 20 Apr '18

20 Apr '18

I am trying to use one of data struct class defined in c# dll to python script. I am facing difficulty in adding c# object under payload. Can anyone give me hint or any example which will useful for assigning payload under object array. public class TestPayload { public string RequestId { get; set; } public byte[] ServiceIds { get; set; } public object[] Payload { get; set; } public bool IsStatus { get; set; } public long ExpiryDateTime { get; set; } } Note : I am able to add other parameter defined in class & pass from python script to c#. Thanks

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How to pass Out parameter
by techi eth 18 Apr '18

18 Apr '18

Hi I have once class function in C# which is expecting out parameter. How can I pass out parameter from python. Below is signature of function. public void GetOutData(string InputData, out bool isHavingParams, out string Parm1, out int32 Parm2, out object Parm3)

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Runtime.Py_Main function call
by techi eth 16 Apr '18

16 Apr '18

Calling below function resulting thread launch from C# process or it is new process itself. Runtime.Py_Main(cmd.Length, cmd) I am referring console example for nPython.exe. Below is code snippet. public static int Main(string[] args) { // reference the static assemblyLoader to stop it being optimized away AssemblyLoader a = assemblyLoader; string[] cmd = Environment.GetCommandLineArgs(); PythonEngine.Initialize(); int i = Runtime.Py_Main(cmd.Length, cmd); PythonEngine.Shutdown(); return i; } Thanks

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crash in pythonnet
by techi eth 05 Apr '18

05 Apr '18

Hi, I am trying to run python for NET but finding crash while running test. I am trying to run test from src/tests/. System Setup : Host : Ubuntu14.04 Python : Python2.7 Mono : Mono JIT compiler version 5.10.1.20 (tarball Thu Mar 29 10:42:14 UTC 2018) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: x86 Disabled: none Misc: softdebug Interpreter: yes LLVM: supported, not enabled. GC: sgen (concurrent by default) I am getting below error. *** Error in `python2.7': free(): invalid pointer: 0xb5d37120 *** Stacktrace: at <unknown> <0xffffffff> at (wrapper managed-to-native) Python.Runtime.Runtime.Py_Initialize () <0x00012> at Python.Runtime.Runtime.Initialize () [0x0000a] in <f0f76ef5431f474889e54afa364b2312>:0 at Python.Runtime.PythonEngine.Initialize (System.Collections.Generic.IEnumerable`1<string>,bool) [0x00014] in <f0f76ef5431f474889e54afa364b2312>:0 at Python.Runtime.PythonEngine.Initialize (bool) [0x00005] in <f0f76ef5431f474889e54afa364b2312>:0 at Python.Runtime.PythonEngine.InitExt () [0x00000] in <f0f76ef5431f474889e54afa364b2312>:0 at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) [0x0001e] in <65984520577646ec9044386ec4a7b3dd>:0 Attached core dump for more details. Please give me hint what is wrong.

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Creating an Installer for C# Apps that use Python.Runtime
by Andrew Yang 20 Mar '18

20 Mar '18

Hi All, This might be a really dumb question, but I was wondering how can I create an installer for a C# wpf app, that uses pythonnet's Python.Runtime.dll? Currently, I've created a python module, imported the module in "using (Py.GIL())", and called some functions I've written. What methods are there to allow a user who does not have Python installed to be able to install and use my app (with or without having to install python)? I'm not sure if this is relevant, but I'm only importing from modules I've written or __builtin__ in the module used in my C# app. Additionally, is the Python.Runtime.dll that I build on my machine compatible with my users'? Best regards,Andrew

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Indexer not working on Interop
by Phat Loc 19 Mar '18

19 Mar '18

Hi All, I was expecting the code below to work. Basically I casting a System.__ComObject into a Range Interface ( https://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel.ran…). There should be an indexer but I can't seem to get it to work? Thanks, Phat from PyExcel import PyAddin import Microsoft.Office.Interop.Excel as Excel app = Excel._Application(PyAddin.CurrentInstance.ExcelApp) selection = Excel.Range(app.Selection) In [5]: selection[1,1] --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-5-bb1b652c6740> in <module>() ----> 1 selection[1,1] TypeError: 'Range' object is not subscriptable In [6]: selection.Cells[1,1] --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-6-f8b14ac4d116> in <module>() ----> 1 selection.Cells[1,1] TypeError: unindexable object In [7]: selection.Cells(1,1) --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-7-e8b900b98026> in <module>() ----> 1 selection.Cells(1,1) TypeError: object is not callable

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