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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You can check out the files in question here: <a
href="http://github.com/devhawk/devhawk_ipy/tree"><span style='color:#1F497D;
text-decoration:none'>http://github.com/devhawk/devhawk_ipy/tree</span></a>.
... those files are patched now to use the below&#8230;which uses &#8220;with&#8221; to ensure
the Dispose(). So the file is closed after the lines in the file are read.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Adam</span><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'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Adam Brand<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>SilverKey Technologies<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<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>Curt Hagenlocher<br>
<b>Sent:</b> Sunday, March 29, 2009 6:27 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] try...finally in yield<o:p></o:p></span></p>

</div>

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

<p class=MsoNormal style='margin-bottom:12.0pt'>Maybe I don't understand the
problem you're having.&nbsp; Can you describe it with a little more
detail?&nbsp; When exactly do you want the file to be closed?<o:p></o:p></p>

<div>

<p class=MsoNormal>2009/3/29 Adam Brand &lt;<a
href="mailto:adamb@silverkeytech.com">adamb@silverkeytech.com</a>&gt;<o:p></o:p></p>

<div>

<div>

<p><span style='font-size:11.0pt;color:#1F497D'>We are using 2.0 beta I think
as part of ipy for <a href="http://asp.net" target="_blank">asp.net</a>. I
don&#8217;t think close() is implemented in that version&#8230; Am I wrong?</span><o:p></o:p></p>

<p><span style='font-size:11.0pt;color:#1F497D'>&nbsp;</span><o:p></o:p></p>

<p><span style='font-size:11.0pt;color:#1F497D'>Harry (who made it) suggested
this:</span><o:p></o:p></p>

<p><span style='font-family:Courier'>def _process(xr):<o:p></o:p></span></p>

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<p class=MsoNormal><span style='font-family:Courier'><br>
&nbsp; while xr.Read():<br>
&nbsp;&nbsp;&nbsp; xr.MoveToContent()<br>
&nbsp;&nbsp;&nbsp; node = XmlNode(xr)<br>
&nbsp;&nbsp;&nbsp; yield node<br>
&nbsp;&nbsp;&nbsp; if xr.IsEmptyElement:<o:p></o:p></span></p>

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<p class=MsoNormal><span style='font-family:Courier'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
node = XmlNode(xr, endElement=True)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; yield node</span><o:p></o:p></p>

<p>&nbsp;<o:p></o:p></p>

<p><span style='font-family:Courier'>def load(xml):<br>
&nbsp; &quot;&quot;&quot;generates an iterator over the XmlNodes in the stream
of XML represented by the xml argument&quot;&quot;&quot;<br>
&nbsp; if isinstance(xml, XmlReader):<br>
&nbsp;&nbsp;&nbsp; for n in _process(xml): yield n<br>
&nbsp; else:<br>
&nbsp;&nbsp;&nbsp; with XmlReader.Create(xml) as xr:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for n in _process(xr): yield n</span><o:p></o:p></p>

<p><span style='font-size:11.0pt;color:#1F497D'>&nbsp;</span><o:p></o:p></p>

<p><span style='font-size:11.0pt;color:#1F497D'>&nbsp;</span><o:p></o:p></p>

<p><span style='font-size:11.0pt;color:#1F497D'>Adam Brand</span><o:p></o:p></p>

<p><span style='font-size:11.0pt;color:#1F497D'>SilverKey Technologies</span><o:p></o:p></p>

<p><span style='font-size:11.0pt;color:#1F497D'>&nbsp;</span><o:p></o:p></p>

<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>

<p><b><span style='font-size:10.0pt'>From:</span></b><span style='font-size:
10.0pt'> <a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>
[mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Curt Hagenlocher<br>
<b>Sent:</b> Saturday, March 28, 2009 7:39 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] try...finally in yield</span><o:p></o:p></p>

</div>

<div>

<div>

<p>&nbsp;<o:p></o:p></p>

<p style='margin-bottom:12.0pt'>So I assume you're calling close() on the
generator?&nbsp; A try/finally around the code in the generator can be used to
catch the StopIteration exception and force the dispose.&nbsp; But even better,
you could say &quot;from __future__ import with_statement&quot; at the top of
your file and then say something like this:<br>
<br>
def parse(xml):<br>
&nbsp;&nbsp;&nbsp; with XmlReader.Create(xml) as xr<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; while xr.Read():<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [...]<br>
<br>
We automatically do the right thing when using &quot;with&quot; and
IDisposable, so &quot;with&quot; effectively becomes like a C#
&quot;using&quot; block.<o:p></o:p></p>

<div>

<p>2009/3/28 Adam Brand &lt;<a href="mailto:adamb@silverkeytech.com"
target="_blank">adamb@silverkeytech.com</a>&gt;<o:p></o:p></p>

<p style='margin-bottom:12.0pt'>I'm using IronPython for ASP.Net...have some
code (not mine, <a
href="http://devhawk.net/2008/05/07/Deserializing+XML+With+IronPython.aspx"
target="_blank">http://devhawk.net/2008/05/07/Deserializing+XML+With+IronPython.aspx</a>
- Harry Pierson's) that converts an xml file into an object. It has the below
function:<br>
<br>
def parse(xml):<br>
&nbsp;&nbsp;&nbsp; xr = XmlReader.Create(xml)<br>
&nbsp;&nbsp;&nbsp; while xr.Read():<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; xr.MoveToContent()<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; node = XmlNode(xr)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; yield node<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (xr.IsEmptyElement):<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
node.nodeType = XmlNodeType.EndElement<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; del
node.attributes<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; yield node<br>
<br>
This code is problematic as it locks the xml file it is reading. I tried a
try...finally to do a .Close() and .Dispose(), but the compiler was not happy
with that. Just putting .Close() and .Dispose() at the end doesn't work.<br>
<br>
In reading up, I found this:<br>
<a href="http://docs.python.org/whatsnew/2.5.html#pep-342" target="_blank">http://docs.python.org/whatsnew/2.5.html#pep-342</a><br>
<br>
&quot;The addition of the close() method has one side effect that isn&#8217;t
obvious. close() is called when a generator is garbage-collected, so this means
the generator&#8217;s code gets one last chance to run before the generator is
destroyed. This last chance means that try...finally statements in generators
can now be guaranteed to work; the finally clause will now always get a chance
to run. The syntactic restriction that you couldn&#8217;t mix yield statements with a
try...finally suite has therefore been removed. &quot;<br>
<br>
I'm guessing that this isn't implemented in the version of IronPython in IP for
ASP.Net.<br>
<br>
Does anyone have any ideas on a workaround for the generator for this version?<br>
<br>
Thanks,<br>
Adam<br clear=all>
<br>
-- <br>
<span style='color:#888888'>Adam Brand<br>
<br>
</span><br>
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<p>&nbsp;<o:p></o:p></p>

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