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<div class=Section1>

<p class=MsoNormal><span style='color:#1F497D'>From a development and testing
perspective, few other changes (if any) should be required, and are best
addressed on a case-by-case basis. We&#8217;re definitely trying to minimize
the number of breaking changes between the .NET 2.0 and 4.0 builds, especially
any that would be visible from pure Python. That being said, some changes are
inevitable, so this is not a 100% guarantee. Personally, I would suggest
testing against both builds of IronPython well before the migration. Whether or
not such testing is feasible, we&#8217;d love to hear from you and help sort out
any problems you run into.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>As for your last question, it
sort of depends on what you mean by &#8220;official&#8221; (for example, we don&#8217;t
ship in-the-box with Visual Studio). But by almost any other standard, IronPython
and IronRuby are both official Microsoft dynamic languages.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Happy scripting!<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>- David<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>

<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>Neelima Potti<br>
<b>Sent:</b> Thursday, January 28, 2010 6:59 AM<br>
<b>To:</b> 'Discussion of IronPython'<br>
<b>Subject:</b> Re: [IronPython] to invoke ironpython from runtime in .NET
framework 4.0<o:p></o:p></span></p>

</div>

</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<p class=MsoNormal><span style='color:#1F497D'>Thank you David. That explains
the things.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>We have a .NET application on
.NET framework 3.5 where we want to use IronPython for some validations. This
application will be eventually migrated to .NET 4.0.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>So my question is if we develop
using IronPython 2.6, when we migrate to .NET 4.0, what are the changes
required for Ironpython?<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Is it only the references that
need to be replaced with IronPython 2.6 CTP references or will there be
subsequent changes that need to be done?<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Will there be any changes from
development, testing perspective?<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>And other trivial Q: Is IronPython an official Micorsoft dynamic
scripting language?<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>&nbsp;<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>Thank you<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>Neelima<o:p></o:p></span></p>

</div>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>

<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>David DiCato<br>
<b>Sent:</b> Tuesday, January 26, 2010 4:58 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] to invoke ironpython from runtime in .NET
framework 4.0<o:p></o:p></span></p>

</div>

</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='color:#1F497D'>The DLR is not exclusively for
.NET 4.0, and until recently, it was not part of the framework. Starting with
.NET 4.0, core bits of the DLR have been added as a feature.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>IronPython 2.6 runs on .NET 2.0
SP1 and contains its own distribution of the DLR. The release page refers to
this distribution when it mentions the update. On the other hand, IronPython
2.6 CTP for .NET 4.0 Beta 2 does not need to include the DLR core.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>Hope this clears things up,<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>- David<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>

<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>Neelima Potti<br>
<b>Sent:</b> Tuesday, January 26, 2010 1:24 PM<br>
<b>To:</b> 'Discussion of IronPython'<br>
<b>Subject:</b> Re: [IronPython] to invoke ironpython from runtime in .NET
framework 4.0<o:p></o:p></span></p>

</div>

</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<div>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>Thank you Dino&#8230;it worked.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>but&nbsp;I have a Q: <o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'><a
href="http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=12482">http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=12482</a>...
Whose release notes say &#8220;</span><span style='font-size:9.5pt;font-family:
"Segoe UI","sans-serif";color:#30332D'>Updating to the latest version of the
DLR&#8221;..so doesn&#8217;t that mean it is .NET framework 4.0 as DLR is for
.NET 4.0</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><a
href="http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=28125">http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=28125</a>
&#8230;</span><span style='font-size:9.5pt;font-family:"Segoe UI","sans-serif";
color:#30332D'>&quot;IronPython 2.6 CTP for .NET 4.0 Beta 2&quot;.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:9.5pt;font-family:"Segoe UI","sans-serif";
color:#30332D'>In terms of DLR..what is the difference between the above 2
releases&#8230;<o:p></o:p></span></p>

</div>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>

<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> users-bounces@lists.ironpython.com
[mailto:users-bounces@lists.ironpython.com] <b>On Behalf Of </b>Dino Viehland<br>
<b>Sent:</b> Monday, January 25, 2010 4:51 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] to invoke ironpython from runtime in .NET
framework 4.0<o:p></o:p></span></p>

</div>

</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal><span style='color:#1F497D'>You need to download the version
of IronPython which is built for .NET 4.0: <a
href="http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=28125">http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=28125</a><o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'>That&#8217;ll just work and
it&#8217;ll support interop w/ C# 4.0.<o:p></o:p></span></p>

<p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>

<div>

<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>

<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>Neelima Potti<br>
<b>Sent:</b> Monday, January 25, 2010 1:48 PM<br>
<b>To:</b> users@lists.ironpython.com<br>
<b>Subject:</b> [IronPython] to invoke ironpython from runtime in .NET
framework 4.0<o:p></o:p></span></p>

</div>

</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Hi,<o:p></o:p></p>

<p class=MsoNormal>I am new to IronPython..<o:p></o:p></p>

<p class=MsoNormal>I have downloaded IronPython from the website <o:p></o:p></p>

<p class=MsoNormal><a href="http://www.codeplex.com/IronPython">http://www.codeplex.com/IronPython</a>
lastweek.<o:p></o:p></p>

<p class=MsoNormal>When I open IronPython Console, it shows<o:p></o:p></p>

<p class=MsoNormal>IronPython 2.6 (2.6.10920.0) on .NET 2.0.50727.3053<o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>I am trying to invoke the Python engine at run time <o:p></o:p></p>

<p class=MsoNormal>By calling in c# source(.NET 4.0 framework)<o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>_runtime = <span style='color:#2B91AF'>ScriptRuntime</span>.CreateFromConfiguration()<o:p></o:p></span></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>When I add Microsoft.Scripting as a Reference to this
project, it shows the version as 2.6.911.0<o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>And my app.config has<o:p></o:p></p>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&lt;?</span><span style='font-size:9.5pt;
font-family:Consolas;color:#A31515'>xml</span><span style='font-size:9.5pt;
font-family:Consolas;color:blue'> </span><span style='font-size:9.5pt;
font-family:Consolas;color:red'>version</span><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>=</span><span style='font-size:9.5pt;
font-family:Consolas'>&quot;<span style='color:blue'>1.0</span>&quot;<span
style='color:blue'>?&gt;</span><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&lt;</span><span style='font-size:9.5pt;
font-family:Consolas;color:#A31515'>configuration</span><span style='font-size:
9.5pt;font-family:Consolas;color:blue'>&gt;</span><span style='font-size:9.5pt;
font-family:Consolas'><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp; &lt;</span><span style='font-size:9.5pt;
font-family:Consolas;color:#A31515'>configSections</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>&gt;</span><span
style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp;&nbsp;&nbsp; &lt;</span><span
style='font-size:9.5pt;font-family:Consolas;color:#A31515'>section</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'> </span><span
style='font-size:9.5pt;font-family:Consolas;color:red'>name</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>=</span><span
style='font-size:9.5pt;font-family:Consolas'>&quot;<span style='color:blue'>microsoft.scripting</span>&quot;<span
style='color:blue'> </span><span style='color:red'>type</span><span
style='color:blue'>=</span>&quot;<span style='color:blue'>Microsoft.Scripting.Hosting.Configuration.Section,
Microsoft.Scripting, Version=2.6.911.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35</span>&quot;<span style='color:blue'> </span><span
style='color:red'>requirePermission</span><span style='color:blue'>=</span>&quot;<span
style='color:blue'>false</span>&quot;<span style='color:blue'>/&gt;</span><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp; &lt;/</span><span style='font-size:
9.5pt;font-family:Consolas;color:#A31515'>configSections</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>&gt;</span><span
style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp; &lt;</span><span style='font-size:9.5pt;
font-family:Consolas;color:#A31515'>microsoft.scripting</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>&gt;</span><span
style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp;&nbsp;&nbsp; &lt;</span><span
style='font-size:9.5pt;font-family:Consolas;color:#A31515'>languages</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>&gt;</span><span
style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;</span><span
style='font-size:9.5pt;font-family:Consolas;color:#A31515'>language</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'> </span><span
style='font-size:9.5pt;font-family:Consolas;color:red'>names</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>=</span><span
style='font-size:9.5pt;font-family:Consolas'>&quot;<span style='color:blue'>IronPython,Python,py</span>&quot;<span
style='color:blue'> </span><span style='color:red'>extensions</span><span
style='color:blue'>=</span>&quot;<span style='color:blue'>.py</span>&quot;<span
style='color:blue'> </span><span style='color:red'>displayName</span><span
style='color:blue'>=</span>&quot;<span style='color:blue'>IronPython 2.0 Beta</span>&quot;<span
style='color:blue'> </span><span style='color:red'>type</span><span
style='color:blue'>=</span>&quot;<span style='color:blue'>IronPython.Runtime.PythonContext,IronPython,
Version=2.0.0.0000, Culture=neutral, PublicKeyToken=31bf3856ad364e35</span>&quot;<span
style='color:blue'>/&gt;</span><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp;&nbsp;&nbsp; &lt;/</span><span
style='font-size:9.5pt;font-family:Consolas;color:#A31515'>languages</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>&gt;</span><span
style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&nbsp; &lt;/</span><span style='font-size:
9.5pt;font-family:Consolas;color:#A31515'>microsoft.scripting</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>&gt;</span><span
style='font-size:9.5pt;font-family:Consolas'><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&lt;</span><span style='font-size:9.5pt;
font-family:Consolas;color:#A31515'>startup</span><span style='font-size:9.5pt;
font-family:Consolas;color:blue'>&gt;&lt;</span><span style='font-size:9.5pt;
font-family:Consolas;color:#A31515'>supportedRuntime</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'> </span><span
style='font-size:9.5pt;font-family:Consolas;color:red'>version</span><span
style='font-size:9.5pt;font-family:Consolas;color:blue'>=</span><span
style='font-size:9.5pt;font-family:Consolas'>&quot;<span style='color:blue'>v4.0</span>&quot;<span
style='color:blue'> </span><span style='color:red'>sku</span><span
style='color:blue'>=</span>&quot;<span style='color:blue'>.NETFramework,Version=v4.0</span>&quot;<span
style='color:blue'>/&gt;&lt;/</span><span style='color:#A31515'>startup</span><span
style='color:blue'>&gt;&lt;/</span><span style='color:#A31515'>configuration</span><span
style='color:blue'>&gt;</span><o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>During runtime, I get the error:<o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>An error occurred creating the configuration section
handler for microsoft.scripting: Could not load file or assembly
'Microsoft.Scripting, Version=2.6.911.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located
assembly's manifest definition does not match the assembly reference.
(Exception from HRESULT: 0x80131040<o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>What am I missing here? Is my version wrong or
publicKeyToken wrong or??<o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>Any help would be greatly appreciated<o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>Thank you<o:p></o:p></span></p>

<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.5pt;
font-family:Consolas'>NPotti <o:p></o:p></span></p>

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