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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think you can depend upon this behavior. Compiled loader
support is implemented as a meta path hook and therefore the pure Python
version of this looks like:<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'>import sys<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'>class my_loader(object):<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> def
find_module(self, fullname, path):<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> print
'find', fullname<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> if
fullname == 'foo': return module_loader()<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'>class module_loader(object):<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> def
load_module(self, fullname):<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> print
'load', fullname<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> if
fullname == 'foo':<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> res
= __import__('x')<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> sys.modules['foo']
= res<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> res.__name__
= 'foo'<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> res.__path__
= ['foo']<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> return
res<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'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>sys.meta_path.append(my_loader())<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'>from foo import foo<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>from foo.bar import bar<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'>On disk x is a package which has your 1<sup>st</sup> package
structure, foo is a package which has your 2<sup>nd</sup> package
structure. The loader hook in this case is importing x, renaming it to
foo, and then it doesn’t resolve foo.bar. That turns into a full lookup
and the importer rules dictate that we’ll happily look on disk because
foo appears to be a parent package. This outputs the same on CPython and
IronPython so I’m pretty sure we’re correct here </span><span
style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</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> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>As to the identity of the modules – the compiled modules
always win because the meta path hooks get to execute first. So you’ll
only ever successfully import compiled modules if they exist. So while
you can augment an existing package you cannot replace files from it.<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'><o:p> </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>Glenn Jones<br>
<b>Sent:</b> Monday, December 08, 2008 3:40 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> [IronPython] Compiled IronPython mixed with source files<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hi all,<br>
<br>
In our work to get Resolver One working on IronPython 2, we've noticed this
interesting behaviour and would like to know whether it's defined behaviour
that we can rely on or just happenstance.<br>
<br>
Create a package with the following structure:<br>
+ foo<br>
|----__init__.py<br>
|----foo.py<br>
<br>
where foo.py contains<br>
print "foo (compiled)"<br>
<br>
and compile it to foo.dll.<br>
<br>
Now change foo.py to<br>
print "foo (not compiled)"<br>
<br>
and add a bar package:<br>
<span style='font-family:"Courier New"'>+ foo<br>
|----__init__.py<br>
|----foo.py<br>
|---+ bar<br>
|--- __init__.py<br>
|--- bar.py</span><br>
<br>
where bar contains:<br>
print "bar (not compiled)"<br>
<br>
then, the following code:<br>
<span style='font-family:"Courier New"'>import clr<br>
clr.AddReference('foo')<br>
from foo import foo<br>
from foo.bar import bar</span><br>
<br>
outputs:<br>
foo(compiled)<br>
bar (not compiled)<br>
<br>
and removing the AddReference line outputs:<br>
foo (not compiled)<br>
bar (not compiled)<br>
<br>
<br>
This makes it clear that we can have a package that is split between compiled
dll and source and that they work together.<br>
<br>
Can we rely on this behaviour? Is there a specified order in which imports from
different sources are resolved? How is the multiple identity of the foo module
(compiled and not compiled) handled?<br>
<br>
Thanks<br>
<br>
Glenn & Michael<br>
<br>
<o:p></o:p></p>
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