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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The main motivation was to not make policy decisions for the
host. The host may or may not want sys.modules[“__main__”] to
exist. We leave it up to the host to do whatever is right for its scenario. For
eg, “ipy.exe foo.py” does not use the default module, and instead creates
a new OptimizedEngineModule and publishes that as “__main__”.<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:9.0pt;font-family:"Segoe UI","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:9.0pt;font-family:
"Segoe UI","sans-serif";color:windowtext'> users-bounces@lists.ironpython.com
[mailto:users-bounces@lists.ironpython.com] <b>On Behalf Of </b>Jesse Wiles<br>
<b>Sent:</b> Wednesday, August 30, 2006 4:26 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] if __name__ == '__main__' broken in RC2?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>OK.
So, I think I get the how, but I don't understand the why. If I execute a
python file using PythonEngine.Execute(), why doesn't it just do the right
thing? Why do I have to instruct the embedded engine to behave like the
CPython implementation. Why doesn't it just do it?<br>
</span><br>
Shri Borde wrote: <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>pythonEngine.Execute(“print __name__”) is exactly
the same as doing pythonEngine.Execute(“print __name__”,
pythonEngine.DefaultModule). The issue is that the name of
pythonEngine.DefaultModule is not “__main__”. Also, it is not
published in sys.modules since its upto the host to determine which modules are
published and which are not.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>So you would need to do the following for it to print
“__main__”.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>bool shouldPublishMainModule; // You get to chose what this
value should be. It should probably be true for “__main__”.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>EngineModule mainModule =
pythonEngine.CreateModule(“__main__”, shouldPublishMainModule);</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>pythonEngine.Execute(“print __name__”, <b>mainModule</b>)</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
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<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Segoe UI","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:9.0pt;font-family:
"Segoe UI","sans-serif";color:windowtext'> <a
href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>
[<a href="mailto:users-bounces@lists.ironpython.com">mailto:users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Dino Viehland<br>
<b>Sent:</b> Wednesday, August 30, 2006 8:49 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] if __name__ == '__main__' broken in RC2?</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We haven’t had any other reports of issues like this so
we’ll need some more details.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Are you creating a module named __main__ ? (the console
creates an engine named __main__, but if you’re using the engine directly
we never create a __main__ module for you). How is it not evaluating
properly? Are we thinking we’re in main or not in main? </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><o:p></o:p></p>
<div>
<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 class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Segoe UI","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:9.0pt;font-family:
"Segoe UI","sans-serif";color:windowtext'> <a
href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>
[<a href="mailto:users-bounces@lists.ironpython.com">mailto:users-bounces@lists.ironpython.com</a>]
<b>On Behalf Of </b>Jesse Wiles<br>
<b>Sent:</b> Wednesday, August 30, 2006 7:51 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> [IronPython] if __name__ == '__main__' broken in RC2?</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Helvetica","sans-serif"'>Hi,<br>
<br>
I'm running into a problem where if __name__ == '__main__' is not evaluating
properly when using PythonEngine from my assembly. Is this a known issue?<br>
<br>
Thanks,<br>
Jesse Wiles</span><o:p></o:p></p>
<pre><o:p> </o:p></pre><pre style='text-align:center'>
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