Mailman 3 February 2011 - Python.NET

Setting PYTHONPATH from code
by Sharon Rozenblum 05 Apr '13

05 Apr '13

Hi! Can someone tell me how to set PYTHONPATH variable in code when working with Python.Runtime.dll without changing the value in the system variables before. Thanks SHARON ________________________________ 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).

6 12

Pythonnet for Python2.7 binary distribution?
by Olof Bjarnason 06 Mar '11

06 Mar '11

Hi Python.NET (is that the correct spelling..?) community! I learned of Python.NET today. I love the idea of being able to use the .NET assemblies/types directly from CPython. I've tried IronPython before, but it just does not feel Python enough for me :) But I failed to play with Python.NET tonight, since I'm at a CPython2.7 computer. I couldn't find a 2.7 port of Python.NET on SF, even though I found a note about the changes necessary already being available: http://sourceforge.net/tracker/?func=detail&aid=3094895&group_id=162464&ati… /Olof PS. I'd love to help somehow with this project, since my day-time work is with a C# program, and I'm trying to integrate Python into "the loop" more and more. DS

2 2

Can you recommend an Experienced Python/SQL contract developer for this 6 - 12 month contract in NYC?
by Ben B. Diamond 25 Feb '11

25 Feb '11

Experienced Python/SQL contract developer * 3+ years experience writing clean, concise Python * 3+ years experience tracing, debugging, and maintaining existing code * Experience working closely with a team in a fluid environment with evolving requirements * Strong CS fundamentals (algorithms & data structures) * Nice to have: Experience writing and tuning SQL queries * Nice to have: Unix scripting / ops / "handyman" experience * strong Python skills * experience with Python web servers (Tornado experience a plus) * experience with HTML templates * strong SQL skills (MS SQL Server a plus) * experience optimizing database views using clustered indexes or other database structures * Linux server administration skills, experience with puppet and/or fabric is a huge plus * any of nginx, memcached, mongodb experience a plus * Ability to self-manage and stay productive by oneself * Ability to work with stakeholders to formulate system requirements * Works well with both developers and non-developers. * Flexible work schedule (ie-willing to work off-hours, if necessary) * experience with Javascript and complex CSS styling * CDN experience (Rackspace cloudfiles a huge plus) * experience with writing scheduling and/or learning algorithms * MS Excel spreadsheet skills Thanks, Ben Diamond The Forum Group Information Technologies Division 260 Madison Ave Suite 200 NY, NY 10016 T. 212 687 4050 x355 C. 201 313 6009 www.forumgrp.com <http://www.forumgrp.com/> <http://www.linkedin.com/profile?viewProfile=&key=20302042&trk=tab_pro> Providing specialized permanent and contract staffing services since 1974 Accounting & Taxation | Human Resources | Office Support Administration | Legal | Advertising/Communications/Creative Services Marketing/Market Research | Information Technology | Finance & Banking | Healthcare

1 0

Re: [Python.NET] Invoking IPython programmatically
by Frank Smith 20 Feb '11

20 Feb '11

The requirement I have is the ability to work with the .net side of my application interactively with Python. I really like the various autocomplete features of ipython, which is why I decided to go that way. I finally figured out how to invoke ipython programmatically, using one of the Python environment variables, PYTHONSTARTUP, I believe. I'm on vacation at the moment so I don't have all of the details handy, but when I get back I will post them. Barton, can you please elaborate on why you think I should stay far away from ipython? If there are significant issues, I would be very interested in learning about them. Thanks, Frank. Sent from my iPad On 2011-02-19, at 4:16 PM, Barton <barton(a)BCDesignsWell.com> wrote: > Hello, Frank, > I was just going through the archives - don't know why this wasn't delivered to my email: > > I routinely mix Python/wxPython/etc. with .NET via PythonDotNet without the need for IPy. > Is there some special need that you have for IPy or have you jumped to the conclusion that it is required? > > Unless you have some special need to make IPy part of your application, please stay far, far away from it (you'll thank yourself later). > > Please feel free to continue the discussion on the list - I'm replying directly because I am unable to site your original mail. > > Thanks, > Barton

2 1

[Patch] Python.NET build on Ubuntu 10.04/Mono 2.4.4/Python2.6
by VIKAS DHIMAN 13 Feb '11

13 Feb '11

Hi all, Through some dirty fixes, I was able to build Python.NET on Ubuntu. Can anyone please review and merge my patch (attached) ? Thanks, Vikas Changes: 1. Added namespace to src/runtime/pyansistring.cs 2. Some generalizations in src/monoclr/Makefile 3. I was getting error "Irrecoverable syntax error" with ilasm on clrmodule.il . Fixed by following changes: 3.1 Renamed src/runtime/clrmodule.il to src/runtime/clrmodule.pp.il . 3.2 Modified ./Makefile to run cpp preprocessor on src/runtime/ clrmodule.pp.il and generate src/runtime/clrmodule.il

3 2

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

3 4

Invoking IPython programmatically
by Frank Smith 12 Feb '11

12 Feb '11

Hello everyone, I am relatively new to Python.NET, and I think that it will serve me very well for the application that I am developing. I am taking an application that had previously been implemented using Python/wxPython/matplotlib/numpy/scipy, and reimplementing it using .NET 4. The main reason that I'm doing this is because the application used to be used primarily by technical people comfortable to working in a Linux environment, but I am interested in making it usable by the Windows crowd. On the other hand, I don't want to give up the ability to script the application with Python, and I don't want to give up using matplotlib/numpy/scipy. This is what has led me to Python.NET. Following the email trail, I have been able to get the Console test program running using VS2010 targeting .NET 4. What I'm now interested in doing is to get IPython to load automatically, so the user does not have to manually import IPython then call the IPShell mainloop. I am using Python 2.6.6, IPython 0.10.1, pyreadline 1.6.2 all on XP SP3 win32. So I modified pythonconsole.py like this: [STAThread] public static int Main(string[] args) { string [] cmd = Environment.GetCommandLineArgs(); PythonEngine.Initialize(); PyObject ip = PythonEngine.ImportModule("IPython"); <<<<<< new int i = Runtime.Py_Main(cmd.Length, cmd); PythonEngine.Shutdown(); return i; } Unfortunately, ImportModule returns null. Then, from the command line, if I manually import IPython, I get this ---- Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import IPython Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python26\lib\site-packages\IPython\__init__.py", line 58, in <module> __import__(name,glob,loc,[]) File "C:\Python26\lib\site-packages\IPython\Shell.py", line 37, in <module> from IPython import ultraTB, ipapi File "C:\Python26\lib\site-packages\IPython\ultraTB.py", line 93, in <module> from IPython import Debugger, PyColorize, ipapi File "C:\Python26\lib\site-packages\IPython\Debugger.py", line 34, in <module> from IPython import PyColorize, ColorANSI, ipapi ImportError: cannot import name PyColorize ---- On the other hand, if I leave out this ImportModule from pythonconsole.py, and manually import IPython from the command line, it imports successfully, and furthermore I can run the IPython mainloop. Ultimately, what I really want to accomplish is to get my .NET 4 application to present the user with an IPython shell that has a .NET "Application" object injected into its namespace, so the user can start interacting with the .NET objects from the application, but also be able to do matplotlib type stuff too. Does anyone have any thoughts as to why I'm having problems importing IPython programmatically? Thanks, -Frank.

1 0

Multiple Initialize, RunSimpleString, Shutdown calls result in AccessViolationException
by Oleksii Bidiuk 09 Feb '11

09 Feb '11

Hi All, I am seeing weird problems with embedding PythonNET/Python 2.6 in a C#, using 4.0 runtime application built with VS2010 on Windows XP SP3. Design outline -------------------- For every script I execute the following sequence on a separate thread (does not seem to matter the same or different one every time) to avoid blocking GUI: PythonEngine.Initialize(); <the following block executed several times with startup scripts and then the actual user script> IntPtr pythonLock = PythonEngine.AcquireLock(); PythonEngine.RunSimpleString(source); PythonEngine.ReleaseLock(pythonLock); PythonEngine.Shutdown(); I use the RunSimpleString() as the RunString() didn't work for me (always returns NULL and does not execute the code, suggestions welcome!). Problem description ----------------------------- Running simple scripts like 'print "whatever"' goes well. I can run scripts multiple (>10) times without any side-effects. Problems start when importing certain modules (like ctypes, numpy), or accessing collections of .NET objects returned by the .NET API. For example, the following scripts will fail executing SECOND time. Whenever I call the script AGAIN I get AccessViolationException or even ExecutionEngineException (with debugger attached of course) in the Shutdown() call. Example 1 --------------- import ctypes Exampe 2 -------------- import clr clr.AddReference("System.Drawing") import System.Drawing bmp = System.Drawing.Bitmap("c:\\image.bmp") I should be doing something completely wrong, but I just cannot see it... Please help! -- oleksii

1 0

Python.NET and VS2010/.NET 4.0
by Bart Jonkers 08 Feb '11

08 Feb '11

Hi, I followed the instructions from oleskii to build Python.NET for .NET4.0. Compilation wend fine but when I try to run python.exe I get the following error: Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'python26': 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) I have installed Python in C:\Python26. Does any one an idea? Is it necessary to use the python.exe build by the project or is it also possible to use the original python executable? When I try to use the original python executable I get the following error: Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import clr Traceback (most recent call last): File "<stdin>", line 1, in <module> SystemError: dynamic module not initialized properly >>> Regards, Bart

3 6

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

1 1