[IronPython] IronPython v2.0 Alpha 2 Released!

陶祖洪 andy.tao at freeborders.com.cn
Mon Jul 2 02:54:29 CEST 2007

Hi, Dino:

	 Thanks for your hard work!

              I noticed that the demos showed on MIX'07 about multiple
script language share data and functions, can you give us a example to do
that using new release.


-----Original Message-----
From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Tony Djordjevski
Sent: Saturday, June 30, 2007 05:52
To: Discussion of IronPython
Subject: Re: [IronPython] IronPython v2.0 Alpha 2 Released!

Hi Dino,

Congrats on the new release!

Can you give us an update on the status of the multiple engine debate and
does this release change anything on that front?

When Alpha 1 was released, we discussed swappable SystemStates as an
alternative to multiple engine instances.  Does this release include this


Dino Viehland wrote:
> Hello IronPython Community,
> We have just released IronPython 2.0 Alpha 2. This release is a snapshot
of the on-going progress with IronPython 2.0 and the DLR.
> One of the most significant changes in this release is the removal of
Microsoft.Scripting.Vestigial. Previously this DLL was a combination of both
IronPython support code as well as portions of the DLR. With Alpha 2
Microsoft.Scripting.dll contains all portions of the DLR and IronPython.dll
contains the IronPython implementation which builds upon the DLR. This
should help consumers of the DLR to better understand the public surface
area. Being early in the product cycle this surface area may still change
significantly but there are now bright lines between what DLR code is and
what IronPython code is.
> IronPython also continues to use the underlying concepts of the DLR more
and more. In the Alpha 1 release there were numerous locations where
IronPython would use DynamicSites but fallback to runtime lookups because
the site couldn't perform optimally. In this release we've continued to
flush out these corner cases and improve IronPython's support for generating
proper rules when using DynamicSites. We've also improved the shared
infrastructure the DLR provides for creating rules and moved IronPython to
this shared infrastructure.
> Significant changes in the DLR include the removal of Microsoft.Scripting.
Vestigial, continued refinement of the AST and dynamic site support, and
replacement of the old IDynamicObject with the new IDynamicObject.
IronPython has also been updated to use more of the DLR concepts.
> The DLR also continues to be expanded and improved. The DLR AST has been
improved with support for more static constructs such as simple exception
handling constructors and better variable support. The DLR AST factory
methods have also been moved to a static Ast class to enable easier
construction of ASTs. There have also been some additional convenience
methods added to various nodes to make construction even easier still.
Finally the DLR also has been improved to support an arbitrary number of
arguments inside a DynamicSite which helps to enable calling all functions
in an optimized manner.
> One of the most significant (although fairly small) improvements is the
introduction of the IDynamicObject interface under its proper name. In the
Alpha 1 release this interface was temporarily named IActionable because
IronPython had previously shipped with an IDynamicObject interface. In this
new release the old interface has been completely removed and the DLR now
provides the correct IDynamicObject interface. This interface lives at the
heart of the DLR so it's noteworthy that it's now found its final home.
> Note: Due to dependencies upon APIs that are not present in Silverlight 1.
1 Alpha (released at MIX) you won't be able to re-build this release for use
with Silverlight. As both products stabilize more we expect better
compatibility between releases.
> You can download IronPython v2.0 at: 
> http://www.codeplex.com/IronPython/Release/ProjectReleases.aspx?Releas
> eId=5246
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