[Python.NET] Running an embedded interpreter

Serge WEINSTOCK serge.weinstock at uk.bnpparibas.com
Thu Aug 21 11:36:05 CEST 2014


Hi Tony,

I’ve noticed that you are the main contributor for this branch of Python for .Net. Thanks a lot for that contribution.

Maybe you can help me a little more with my issue. I think the main issue is due to the fact that I’m using Python 3.2. 

I’ve done the following tests:
*  Python 3.2 x86:
    * calling .Net libraries from standard python interpreter: works fine.
    * running embedded interpreter from .Net application:
          * from Visual Studio: works fine. Setting PYTHONHOME is enough. No need to set PYTHONPATH
          * from command line: doesn't work. Setting PYTHONPATH improves a little things.
*  Python 3.2 x64:
    * calling .Net libraries from standard python interpreter: works fine.
    * running embedded interpreter from .Net application:
          * from Visual Studio: doesn't work. Setting PYTHONPATH improves a little things.
          * from command line: doesn't work. Setting PYTHONPATH improves a little things.
*  Python 3.3 x86:
    * calling .Net libraries from standard python interpreter: works fine.
    * running embedded interpreter from .Net application:
          * from Visual Studio: works fine.
          * from command line: works fine.

I've also compared for the VS run or for the command line run:
 * the paths given by 'sys.modules'.  They are the same.
 * the paths of the loaded dlls as given by 'listdlls'. They are the same.

Maybe you have a clue on why running an embedded interpreter works with 3.3 but not 3.3

Thanks,
Serge


From: Serge WEINSTOCK 
Sent: 19 August 2014 17:45
To: 'pythondotnet at python.org'
Subject: RE: [Python.NET] Running an embedded interpreter

Hi Tony,

I’ve tried your suggestion but it doesn’t work. 

The issue seems to be more “fundamental” as the import of the .Net System assembly doesn’t work.

Serge

From: pythondotnet-bounces+serge.weinstock=uk.bnpparibas.com at python.org [mailto:pythondotnet-bounces+serge.weinstock=uk.bnpparibas.com at python.org] 
Sent: 19 August 2014 17:16
To: pythondotnet at python.org
Subject: Re: [Python.NET] Running an embedded interpreter

Hi Serge,

'mbcs' is what python uses to mean the current configured encoding. I would guess that the encoding of sys.stdout is different when using visual studio output console than the console.

You could try a different encoding method by setting the PYTHONIOENCODING environment variable before starting your exe, eg:
SET PYTHONIOENCODING=utf-8:ignore

Look for PYTHONIOENCODING here https://docs.python.org/3/using/cmdline.html for more details.

Tony



On Tue, Aug 19, 2014 at 2:22 PM, Serge WEINSTOCK <serge.weinstock at uk.bnpparibas.com> wrote:
Hi,
 
I’m trying to use Python3.2 using the Python.Net version found at: https://github.com/renshawbay/pythonnet
 
I’m using the following simple test program:
 
//=======================================================================
using System;
using System.IO;
using Python.Runtime;
 
namespace TestPythonNet
{
    class Program
    {
        static void Main(string[] args)
        {
            string binDir = Path.GetDirectoryName(System.Reflection.Assembly.GetAssembly(typeof(Program)).Location);
            string pyHome = @"D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime";
            PythonEngine.PythonHome = @"D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime";
            PythonEngine.ProgramName = "PythonRuntime";
            Environment.SetEnvironmentVariable("PYTHONPATH",
                Path.GetFullPath(Path.Combine(pyHome, "DLLs")) + ";" +
                Path.GetFullPath(Path.Combine(pyHome, "Lib")) + ";" +
                Path.GetFullPath(Path.Combine(pyHome, "Lib", "site-packages")) + ";" +
                binDir
                );
            Environment.SetEnvironmentVariable("PYTHONVERBOSE", "1");
            PythonEngine.Initialize();
            PythonEngine.ImportModule("clr");
            using (Py.GIL())
            {
                PythonEngine.RunSimpleString(
                    "import clr; " +
                   "a = clr.AddReference('System'); " +
                    "print(a.Location);" +
                    "from System import Environment;" +
                    "print(Environment.MachineName);");
            }
        }
    }
}
//=======================================================================
 
“D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime” is a folder where I’ve copied the DLLs and Lib folder from a python 3.2 x86 distribution.
 
 
When I run it from Visual Studio it works fine (I guess it may be related to the fact that I’m using python tools for Visual Studio).
 
But when I run it from the console, it fails with the output:
 
//=======================================================================
Traceback (most recent call last):
  File "D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime\Lib\site.py", line 481, in execsitecustomize
    import sitecustomize
UnicodeEncodeError: 'mbcs' codec can't encode characters in position 0--1: invalid character
Traceback (most recent call last):
  File "D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime\Lib\site.py", line 497, in execusercustomize
    import usercustomize
UnicodeEncodeError: 'mbcs' codec can't encode characters in position 0--1: invalid character
C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll
Traceback (most recent call last):
  File "<string>", line 1, in <module>
UnicodeEncodeError: 'mbcs' codec can't encode characters in position 0--1: invalid character
//=======================================================================
 
The “print(a.Location);" works but not the “from System import Environment”. There are also all these errors about mbcs.
 
Any idea on what I’m doing wrong?
 
Thanks,
Serge Weinstock
 

___________________________________________________________
This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited.
Please refer to http://www.bnpparibas.co.uk/en/email-disclaimer/ for additional disclosures.

_________________________________________________
Python.NET mailing list - PythonDotNet at python.org
https://mail.python.org/mailman/listinfo/pythondotnet


___________________________________________________________
This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited.

Please refer to http://www.bnpparibas.co.uk/en/email-disclaimer/ for additional disclosures.


More information about the PythonDotNet mailing list