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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The answer is kind of both. When it comes to the core
language grammar we are (and I believe will always be) an equivalent set.
That’s rather important in that any code which is .NET specific can still
be parsed by other Python implementations and therefore you can do various if I’m
running on IronPython do this else if I’m on Jython do that or if I’m
on CPython do something else – which is a fairly common pattern and even
shows up in the standard library. When it comes to the various builtin
types we intend to be a superset but that superset is only available after the
user has specifically opted in to IronPython.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>So let’s look at some examples how this has played
out. To add generic support we used Python’s existing indexing
support rather than adding parsing support for something like Dictionary<int,
int> which would have matched C#. But at the same time we don’t
want to modify the core objects too much – for example a future version
of CPython could choose to add indexing support to built-in functions to add
some new feature of their own. Therefore our built-in functions which are
generic are actually a subtype of the normal built-in function type and add
indexing. Our normal built-in functions don’t support indexing
(types/generic types actually still need this treatment of not having indexing
by default but I haven’t gotten around to fixing that one yet).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>And of course we try and make sure that all of the extensions
that we do offer are only available on an opt-in basis and that opt-in basis is
per-module rather than tainting all code in the interpreter. That enables
some code to be Python specific and other code to be Ipy specific. That’s
done via “import clr” (or importing any other .NET namespace
actually) which makes any additional attributes that we’ve added to types
available (for example __clrtype__ is not visible until you do an import clr).
That enables us to expose things which are .NET specific but still allows pure
Python code to run without seeing anything change – so for example if some
code as doing dir() it’s not going to freak out because there’s
some unexpected attributes.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<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>Hank Fay<br>
<b>Sent:</b> Tuesday, May 18, 2010 11:11 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> [IronPython] .Net attributes/decorators<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In reviewing the discussion of .Net decorators in the list (thank
you Google Groups), I did not come across a discussion of what I saw as the
central issue: is IronPython to be a Superset of Python (every Python program
will run in IronPython, not every IronPython program will run in Python), or is
IronPython to be an equivalent set (every Python program will run in IPy, and
every IPy will run in Python).<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Has there been a discernment on this issue?<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>For me, coming from a non-Python world, it makes sense to
view IPy as a superset of Python. This perspective would, e.g., allow the
use of .Net decorators on classes (which in turn would facilitate returning
.Net objects). I've read about the ways of using __clrtype__ to do this
in a Pythonic manner. My interest is in simplicity and clarity in my
programs, rather than maintaining two-way compatibility (which I could not
port to Python, in any case, for a .Net program using .Net features).<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>thanks,<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Hank Fay<o:p></o:p></p>
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