Here are the steps I followed :

wget https://github.com/downloads/libevent/libevent/libevent-1.4.13-stable.tar.gz

tar xvzf libevent-1.4.13-stable.tar.gz

mkdir ~/externals

cd libevent-1.4.13-stable

./configure –prefix=$HOME/externals/

make

make install

pip install –install-option=”-I$HOME/externals/include” –install-option=”-L$HOME/externals/lib” gevent

Validating models…
0 errors found

Django version 1.2.1, using settings ‘xxx.settings’
Development server is running at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.

But when I visited the page http://127.0.0.1:8000/ (or http://127.0.0.1:8000/admin) I would get “Page Not Found :/” (or “Page Not Found :/admin” – depending on which page I tried to launch) Since I was trying this app for the first time, I suspected that this must be the problem with the app. I checked with other folks who worked on this project, but I couldn’t get any help.  While reading the Django documentation further – I came across an option to “runserver” command where one can start the server on non-default port. As part of troubleshooting, I just tried it, not hoping for much success, but it worked.

Now I am thinking why doesn’t the app work on default port, but works on non-default port. So I stopped the server (running on non-default port) and tried the URL again. I still got the “Page not found” error, and this made it clear that, some other server was listening on port 8000.  Eventually I was find out the process that was listening on port 8000 using the following command :

netstat -ao | findstr LISTENING

Option ‘0′ prints the process ID – I was able to find out the eecutable using ProcExp (which has replaced my Task Manager) On linux – use “grep” in place of “findstr” and “ps” can be used to find out the executable

What surprised me was even though some process is already listening on default port 8000, How did Django “runserver” did not give an error when it tries to bind to port 8000.  This can be reproduced easily by running two instances of same app (or two different apps) from two different terminals. Second instance should fail while binding to default port – and I expect it to show error – But it doesn’t. If it matters I was using Django 1.2.1 on Windows XP (Python 2.6)

All in all, It was very interesting to troubleshoot the problem.

In my first post about IronPython, I documented how installing IronPython Studio was painful (Needed Visual Studio shell, which in itself was confusing). When I started with IronPython I did not know about any other IDE, hence I went ahead with IronPython Studio. But later I came to know about SharpDevelop.

My initial problem with SharpDevelop was that it needed .NET 3.5 SP1 at the minimum. I had just gone through the painful exercise of downloading and installing the prerequisites for IronPython Studio. So I was in no mood of downloading another big chunk before I can start my IronPython Development. But once I got past my initial development cycle, I wanted to give Sharp Develop a try.

After using both the ID interchangeably, I finally settled on SharpDevelop as my choice for IronPython Development

Why SharpDevelop ?

#develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsoft’s .NET platform

To begin with it is completely free and open source. We like Open Source.  But IronPython Studio is also Free and Open Source. But it needs Visual Studio shell from MS.  There is nothing wrong with that, I think it is a design philosophy. IronPython Studio was probably built with the sole purpose of supporting IronPython IDE. So the developers must have assumed that anyone doing development on MS platform would typically use Visual Studio. Since MS has a free version of Visual Studio, cost is non-issue. That is why IronPython Studio is available in two modes : integrated mode and isolated mode.  Assuming that existence of Visual Studio shell helps in reducing the download size. While IronPython Studio was less than 1MB, Sharp Develop on the other hand is whopping 18 MB.

On the other hand, SharpDevelop was built from ground up with the goal of providing a completely open source alternative to Visual Studio. As the name suggests, probably very first language it supported was C#, and then added support for VB.NET and Boo (and IronPython as of 3.0) one by one.

Support for Visual Studio Solution files

While SharpDevelop aims to be complete alternative for Visual Studio, I think they realize that in real world there are bound to be projects which already have .sln files. So it is important to support .sln files. IronPython Studio on the other hand insists on creating its own .pysln files.

While .pysln may be OK for Standalone IronPython Development, SharpDevelop approach of supporting solution files will be useful when one tries to use IronPython code with other .NET languages like VB.Net and C# (To be fair both use .pyproj project files, which can be open interchangeably in any IDE – But IronPython Studio insisted on creating its own .pysln file when it opened .pyproj)

While I have not used integrated mode of IronPython Studio, SharpDevelop inherently supports multiple .NET languages. It also has feature to convert VB.net code into IronPython. Now how cool is that ?

Third party tools

One of the menu items in SharpDevelop is titled “Quality Tools”. I liked the fact that an IDE cares enough about the quality to integrate various third party tools. It has built in option for Profiler, StyleCop, FxCop, as well as NUnit.  Some of these tools require a third party DLL to work, but that is fair enough.

SharpDevelop also recognized that TortoiseSVN was installed and supported Subversion operations from within the IDE. On the other hand,  free Visual Studio plugin for SVN – AnkhSVN – doesn’t work with free (Express) version of Visual Studio.

So does that mean SharpDevelop is the ultimate IDE for IronPython development ? Not quite. There are certain things that didn’t quite work for me.

Code completion missing ?

Since most of my development has been on *nix platform, I haven’t used much of IDEs. I used Eclipse once is a while for some Java Development, but always felt it to be slow. For pure Python development, I prefer Komodo free IDE on both Ubuntu as well as Windows.  I have also tried Eclipse 3.5 with built-in support for Dynamic languages for Python development on Ubuntu. But none of these provided the auto completion (or intellisense as sometimes it is referred) feature for python/ironpython. I read on one of the blogs that SharpDevelop 3.1 supports code completion for IronPython, but for some reason I was not able to get it working for me (Please let me know in comments, if you know of any configuration that may be required for this)

Folding doesn’t quite work

Another big feature I missed (as compated to Komodo free version) was how folding worked. SharpDevelop support folding only for the code inside a class. Most of code is outside of any of the classess – so I get no folding. Komodo on the other hand support folding for as small as if block.

Closing Remarks

In coming days, I need to integrate my code with VB.Net application. I plan to use SharpDevelop for the entire development. If my colleagues can’t figure out that I am not using Visual Studio, I may suggest the rest of the development team to also try SharpDevelop (and save some buck for the organization – that would be pretty big saving)

This is in continuation with my previous blog post :

To get IronPython to use Standard Python Modules,  one needs to add the following two lines to C:\IronPython-2.0.1\Lib\site.py :

import sys
sys.path.append(r"C:\Python25\Lib")

While this works for most part, it doesn’t help if you are using Python extensions written in C. More about my specific problems in another post. But there is an open source project IronClad to deal specifically with this issue. In the meantime, you can check the differences between IronPython and CPython

Reading (and writing to) CSV file is critical part of my program, while in stadard python it was as easy as “import csv”, the same thing took some efforts to get it working in IronPython. I got the following error for my import statement

Error on line 7 in csv.py
from functools import reduce

I also tried using ActiveState Python 2.5.2.2 (which I already had from few months ago, didn’t feel like downloading the latest version till the problem was fixed) But that didn’t help either. With ActiveState, I got the same error on the same line, except this time it was for _csv.

To Quote from IronPython Cookbook :

For some reason the Python standard library csv module is written in C, which means that it isn’t available to IronPython.

The cookbook points to a third party library called A Fast Csv Reader . The cookbook has a nice example of how to use the said DLL with your IronPython Program.

It wasn’t clear to me as to why I had to register at Code Project to download this binary since it is provided under MIT Open Source License. But whom am I gonna complain to ? Beggars can’t be choosers

After working on initial prototype using pylons, on ubuntu, my employer needed a standalone application (on windows) So I was looking for ways to reuse my python code to avoid double work.  had only heard about iron python but beyond that I did not know anything more.

A bit of research later, I downloaded IronPython from here and IronPython Studio. I was quite thrilled to find out that Microsoft, has created this shell, which allows developers to integrate new languages with Visual Studio Shell.

Installing IronPython Studio

Installing IronPython was very straight forward. Considering it is one of the Python implementation itself, you don’t have to have standard python installed. (But I did, more on that later)

Setting up IronPython Studio wasn’t so straight forward.  I had to download standalone version of Visual Studio shell. But the problem, and it is well documented, is that installing the redistributable package in itself is not the complete step, as you would believe from the website. I confirmed that the package was installed, and stil IronPython Studio would complain, and refuse to proceed. It turns out that you need to install the Visual Studio environment, which is inside this directory structure you just created.

This is NOT enough

This is what IronPython Studio needs

Once I installed Visual Studio Shell, IronPython Studio installed easily.  Using IronPython has been nice experience in just a few hours I have been using it. The Code completion isn’t upto my liking yet, but it is helpful at times.

Using Standard Python Libraries

Since my original code was written on linux, it used only the standard python modules. In a manner of speaking, it was “pure” python code. Since IronPython is an implementation of the Python programming language running under .NET, it was obivious that my code may not work as is. But I’m glad that I did not have to make too many changes to get it working under IronPython.

As is well documented in IronPython Tutorial, it is not very difficult to use standard python libraries with IronPython (with a few exceptions – more about this a little later) To get IronPython to use Standard Python Modules,  one needs to add the following two lines to C:\IronPython-2.0.1\Lib\site.py :

import sys
sys.path.append(r"C:\Python25\Lib")

While this works for most part, it doesn’t help if you are using Python extensions written in C. More about my specific problems in another post. But there is an open source project IronClad to deal specifically with this issue. In the meantime, you can check the differences between IronPython and CPython

Related articles

• IronPython in Action (blogs.msdn.com)
• Why Python? (mehmetalierturk.com)