Mailman 3 June 2006 - Python.NET

Re: [Python.NET] .NET 2 and hang with AcquireLock
by Matthew Pontefract 06 Jun '06

06 Jun '06

Thanks for your reply Brian - I have been playing around with this a fair bit. I checked out the source code from Subversion; the revision from 2nd June built with no problems and so I now have a .NET 2 build which appears to work well from the console etc. Using this from my C# web service exhibits the same behaviour as before however! The problem is really quite tricky because in fact it is wider than I previously suspected: the web service will successfully acquire the lock once or twice in a row, but will then hang at the AcquireLock call regardless of whether a Python exception had been raised in code or not. I don't think any of the C# code would have been called again (and I kept tabs on calls to acquire and drop the lock), nor is there any re-entrant code. This prompted me to change my approach to a rather more satisfactory one anyway: I use ZSI to create a separate web service from python directly and call that web service from my C# app. I use PythonNet because I want to use business code available in .NET assemblies. Thanks to PythonNet it's been a breeze to use Python in what is otherwise a very C# environment - I'm really pleased. Even though I've changed tack, when I have time I'll get a debugger onto the PythonNet code and try and trace this further - I'll post back if I get anywhere. It would be interesting to know if it's something peculiar to me! For your information, as requested, the code where the problem occurred is as follows (it's all a touch noddy - various permutations of this were tried, so that's why the gs lock object rather bizarrely ended up static etc...): public class Reporting { private static IntPtr gs; public static void GenerateReport(String report) { if (!PythonEngine.IsInitialized) { PythonEngine.Initialize(); gs = PythonEngine.AcquireLock(); try { PythonEngine.RunSimpleString("import sys"); PythonEngine.RunSimpleString("sys.path.append('g:/pyccolo')"); PythonEngine.RunSimpleString("from report.server_init import *"); PythonEngine.RunSimpleString("print(sys.path)"); PythonEngine.RunSimpleString("o.flush()"); } finally { PythonEngine.ReleaseLock(gs); } } gs = PythonEngine.AcquireLock(); try { PythonEngine.RunSimpleString("runReport('"+report+"')"); PythonEngine.RunSimpleString("o.flush()"); } finally { PythonEngine.ReleaseLock(gs); } } } Regards Matthew -----Original Message----- From: Brian Lloyd [mailto:Brian.Lloyd@revolution.com] Sent: 06 June 2006 14:24 To: Matthew Pontefract; pythondotnet(a)python.org Subject: RE: [Python.NET] .NET 2 and hang with AcquireLock Hi Matthew - This is a tough kind of problem to debug through email ;) Is there any chance that the exceptions you raise cause any of your C# to be called again? If not, if there is any way you can distill your code to a relatively small example that demonstrates the problem, send it to me and I'll take a look. -Brian > -----Original Message----- > From: pythondotnet-bounces(a)python.org > [mailto:pythondotnet-bounces@python.org] On Behalf Of Matthew > Pontefract > Sent: Tuesday, June 06, 2006 6:08 AM > To: pythondotnet(a)python.org > Subject: [Python.NET] .NET 2 and hang with AcquireLock > > > > Hello > > > I have a question pertaining to running Python NET under .NET > version 2 which, admittedly, is not the version for which the > packages are built. > > > > All works just fine - I am using the PythonEngine inside a > web service, acquiring the GIL before operations, releasing > it in a 'finally' block afterwards. This is fine provided no > python exceptions are raised in the Python code. Even though > the GIL is released in the C#, a subsequent call to > AcquireLock will hang as if waiting for it to be released. No > calls to acquirelock have been made between the last call to > release the GIL and the call that hangs. > > > Has anyone else had this problem? > > > > I am using Python 2.4 > > > > Regards > > Matthew > > > > Dr Matthew Pontefract > > Credaris Portfolio Management > > ________________________________________ > > > > mp(a)credaris.com > > T : (44) 207 925 8365 > > F : (44) 207 925 8399 > > > > CPM Advisers Limited > > Norfolk House > > 30 Charles II Street > > London > > SW1Y 4AE > > www.credaris.com > > > > Regulated by the Financial Services Authority > > > > http://www.credaris.com/disclaimer.php

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Re: [Python.NET] .NET 2 and hang with AcquireLock
by Brian Lloyd 06 Jun '06

06 Jun '06

Hi Matthew - This is a tough kind of problem to debug through email ;) Is there any chance that the exceptions you raise cause any of your C# to be called again? If not, if there is any way you can distill your code to a relatively small example that demonstrates the problem, send it to me and I'll take a look. -Brian > -----Original Message----- > From: pythondotnet-bounces(a)python.org > [mailto:pythondotnet-bounces@python.org] On Behalf Of Matthew > Pontefract > Sent: Tuesday, June 06, 2006 6:08 AM > To: pythondotnet(a)python.org > Subject: [Python.NET] .NET 2 and hang with AcquireLock > > > > Hello > > > I have a question pertaining to running Python NET under .NET > version 2 which, admittedly, is not the version for which the > packages are built. > > > > All works just fine - I am using the PythonEngine inside a > web service, acquiring the GIL before operations, releasing > it in a 'finally' block afterwards. This is fine provided no > python exceptions are raised in the Python code. Even though > the GIL is released in the C#, a subsequent call to > AcquireLock will hang as if waiting for it to be released. No > calls to acquirelock have been made between the last call to > release the GIL and the call that hangs. > > > Has anyone else had this problem? > > > > I am using Python 2.4 > > > > Regards > > Matthew > > > > Dr Matthew Pontefract > > Credaris Portfolio Management > > ________________________________________ > > > > mp(a)credaris.com > > T : (44) 207 925 8365 > > F : (44) 207 925 8399 > > > > CPM Advisers Limited > > Norfolk House > > 30 Charles II Street > > London > > SW1Y 4AE > > www.credaris.com > > > > Regulated by the Financial Services Authority > > > >

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.NET 2 and hang with AcquireLock
by Matthew Pontefract 06 Jun '06

06 Jun '06

Hello I have a question pertaining to running Python NET under .NET version 2 which, admittedly, is not the version for which the packages are built. All works just fine - I am using the PythonEngine inside a web service, acquiring the GIL before operations, releasing it in a 'finally' block afterwards. This is fine provided no python exceptions are raised in the Python code. Even though the GIL is released in the C#, a subsequent call to AcquireLock will hang as if waiting for it to be released. No calls to acquirelock have been made between the last call to release the GIL and the call that hangs. Has anyone else had this problem? I am using Python 2.4 Regards Matthew Dr Matthew Pontefract Credaris Portfolio Management ________________________________________ mp(a)credaris.com T : (44) 207 925 8365 F : (44) 207 925 8399 CPM Advisers Limited Norfolk House 30 Charles II Street London SW1Y 4AE www.credaris.com Regulated by the Financial Services Authority

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something broke?
by Mathew Yeates 05 Jun '06

05 Jun '06

I updated to the latest in svn and now I cant import a delegate defined in my csharp code. ????? C# code public delegate void MyDelegate(); python code from mydll import MyDelegate I get "cannot import name MyDelegate". This worked fine before I updated from svn. ????? Mathew

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Re: [Python.NET] delegate funkiness
by Brian Lloyd 05 Jun '06

05 Jun '06

Update: I had an unboxing problem in the IL I was generating for delegates with value-type return types. Its fixed in svn for the trunk. It'll get merged to the 1.x branch later when I get a few more things finished. -Brian > -----Original Message----- > From: pythondotnet-bounces(a)python.org > [mailto:pythondotnet-bounces@python.org] On Behalf Of Brian Lloyd > Sent: Monday, June 05, 2006 9:28 AM > To: Mathew Yeates; pythondotnet(a)python.org > Subject: Re: [Python.NET] delegate funkiness > > > > I have a delegate in python that returns a bool def returnFalse(): > > return False > > > > However, when this function is called from my c# compiled > .Net program > > it always sees a return value of True. Seen this before? > > (This is with the latest in svn) > > > > Mathew > > Strange -- no, I haven't seen anything like that before. But > I can reproduce it :( > > I've added a failing test case and I'll look into it. > > thx, > > -Brian > > _________________________________________________ > Python.NET mailing list - PythonDotNet(a)python.org > http://mail.python.org/mailman/listinfo/pythondotnet > >

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Re: [Python.NET] delegate funkiness
by Brian Lloyd 05 Jun '06

05 Jun '06

> I have a delegate in python that returns a bool def returnFalse(): > return False > > However, when this function is called from my c# compiled > .Net program it always sees a return value of True. Seen this before? > (This is with the latest in svn) > > Mathew Strange -- no, I haven't seen anything like that before. But I can reproduce it :( I've added a failing test case and I'll look into it. thx, -Brian

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delegate funkiness
by Mathew Yeates 02 Jun '06

02 Jun '06

Hi Brian I have a delegate in python that returns a bool def returnFalse(): return False However, when this function is called from my c# compiled .Net program it always sees a return value of True. Seen this before? (This is with the latest in svn) Mathew

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doc for pythondotnet
by max hung(洪國展) 02 Jun '06

02 Jun '06

Anyone knows where i can find doc or programing guide for pythondotnet?? Thanks! 洪國展 Max Hung 詠發科技 Afa Technologies, Inc. Tel: 886-2-2918-9958 ext. 227 max_hung(a)afatech.com.tw

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Re: [Python.NET] How to run a .py file from C#
by Brian Lloyd 01 Jun '06

01 Jun '06

Have you tried using the PythonEngine.RunString (not RunSimpleString) method? Still not as convenient as having a RunFile, but that should do what you need for now. -Brian > -----Original Message----- > From: pythondotnet-bounces(a)python.org > [mailto:pythondotnet-bounces@python.org] On Behalf Of LIVERNAIS Sylvie > Sent: Thursday, June 01, 2006 11:08 AM > To: pythondotnet(a)python.org > Subject: [Python.NET] How to run a .py file from C# > > Hi, > > I'm a newbie in C# and python and try to run a .py file from > a C# program. > > I tried the same thing from a C++ program using > PyRun_SimpleFile and in the console, I could see the python > execution (the print from python). > > Using Python.Runtime.dll from Python.NET, I saw that such a > fonction is not available, and should use > PythonEngine.ImportModule and PythonEngine.RunString or > PythonEngine.RunSimpleString. The thing is that it only works > for a command written over one line, but if I have a "def" > (which is written over several lines), the RunString doesn't > work any more... So how can I run the whole file, and not > only line by line ? > > By the way, what does exactly the ImportModule function ? > Maybe the .py file is already executed but I can't see it ? > Is there a way to get the output and display it in the console ? > > Thanks for you answer > > __ Sylvie LIVERNAIS ___________ > Applications Cartes à Puce > EID > * : +33 (0) 388 14 28 75 > >

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Re: [Python.NET] Using Python to test .NET application
by Brian Lloyd 01 Jun '06

01 Jun '06

Hi Radhika, The Python for .NET unit test suite (in src/tests of the distro) are probably a pretty good example of what you want to do. -Brian > -----Original Message----- > From: pythondotnet-bounces(a)python.org > [mailto:pythondotnet-bounces@python.org] On Behalf Of > Srivatsa, Radhika > Sent: Thursday, June 01, 2006 12:53 PM > To: pythondotnet(a)python.org > Subject: [Python.NET] Using Python to test .NET application > > Hi, > > I am new to Python and am contemplating of using it to Unit > Test the .NET application written in VC++. I know there is > documentation of using the Python Unit Testing Framework. Is > there anything else (a book or a > website) that'd be helpful in walking me through the steps of > being able to Unit Test the various VC++ classes and their > behavior using Python ? > I mean - what is the best way for me to learn how to go about > writing a Python program to write Unit Test cases ? > Appreciate any info I can get. > > Thanks > > --Radhika > > Radhika Srivatsa > UMS Software Development > Voice: (858)618-2235 > > _________________________________________________ > Python.NET mailing list - PythonDotNet(a)python.org > http://mail.python.org/mailman/listinfo/pythondotnet > >

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