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<p class=MsoNormal>Hello Python Community,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>We’re pleased to announce the release of IronPython
2.6 Alpha 1. As you might imagine, this release is all about supporting
new CPython 2.6 features such as the ‘bytes’ and
‘bytearray’ types (PEP 3112), decorators for classes (PEP 3129),
advanced string formatting (PEP 3101), etc. The minimum .NET version
required for this release is the same as IronPython 2.0; namely .NET 2.0
Service Pack 1. Unlike the 2.0 series of IronPython, we plan to release
only a couple Alphas and Betas of IronPython 2.6. As such, it’s key
that we get your feedback on the release(s) quickly to incorporate requested
changes.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Besides CPython 2.6 features, another significant change in
this release is that ipy.exe now uses “adaptive compilation” by
default. Adaptive compilation is a technique in which IronPython:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Interprets and executes Python method calls up to <i>N</i>
times for a given method. If you’re only going to execute a method
a few times, it’s typically faster to interpret the method instead of
compiling and executing it<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Compiles and executes the Python method call on
the <i>N+1</i> invocation of the method. Compilation of a Python method
is a heavyweight operation, but we can reuse the result for subsequent
invocations<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Reuses the previously compiled method for new calls to
the Python method. This operation is much faster than interpreting the
method call as the method was already compiled in the previous step<o:p></o:p></p>
<p class=MsoNormal>The reason for this change is that it provides a nice
performance gain for Python code containing lots of functions/methods that only
get called a few times. All this said, this feature is still undergoing
active development and as a consequence some Python scripts may actually run
slower with it turned on. For this reason, our old default mode of
running Python scripts is still available by passing the –O or -D flags
to ipy.exe. Any feedback on how this new feature affects your IronPython
applications performance-wise would be greatly appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>There’s also a few minor changes since IronPython
2.0.1 that are worth calling out here:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>IronPython.msi now installs NGEN’ed
binaries by default<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>IronPython.msi now offers a little more selection
with respect to what you’d like to install. For example,
Silverlight templates are optional<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>The default installation location of
IronPython.msi no longer indicates whether the 2.6 release is an Alpha, Beta,
or a patched release. Future IronPython 2.6 installations will replace
previous 2.6 releases which will be uninstalled automatically<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>The -X:PreferComInteropAssembly flag has been
removed. All COM interop is now done through normal COM dispatch <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>You can download IronPython 2.6 Alpha 1 at: <a
href="http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=22982"><span
style='color:windowtext'>http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=22982</span></a>
<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The IronPython Team<o:p></o:p></p>
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