Hello guys,
In Resolver One we use the IronPython hosting API from inside IronPython
code. I've noticed an oddity that is not how I would expect the hosting
API to behave if I was using it from C#.
My understanding is that the correct way to publish a module (make it
available for a ScriptEngine to import) is to set it in
'engine.Runtime.Globals'.
If I do this from within IronPython code with a module I have already
imported and then execute an import statement in the engine, the module
is re-imported (code executed) rather than using the one I have
published to the runtime globals.
If I have a 'foobar' module that prints when importing, the following
code prints twice instead of the once I would expect:
import sys
import clr
clr.AddReference('IronPython')
clr.AddReference('Microsoft.Scripting')
from IronPython.Hosting import Python
from Microsoft.Scripting import SourceCodeKind
import foobar
engine = Python.CreateEngine()
engine.Runtime.Globals.SetVariable('foobar', sys.modules['foobar'])
source = engine.CreateScriptSourceFromString('import foobar\r\n',
SourceCodeKind.Statements)
scope = engine.CreateScope()
source.Compile().Execute(scope)
*However*, if I change the code to not use Runtime.Globals, but instead
do the following, then the module is only imported once and I get one
print as expected:
hostedSys = Python.GetSysModule(engine)
hostedSys.modules['foobar'] = sys.modules['foobar']
Is there something I have overlooked here?
As a minor supplementary question, how do I get a reference to the
default ScriptScope on an engine? Is there any performance advantage in
using the default one, can I replace it, and does replacing it remove
any performance benefits we might have got? (OK, so strictly speaking
that wasn't just one question...)
All the best,
Michael Foord
--
Michael Foord
Senior Software Engineer, Resolver Systems Ltd.
[EMAIL PROTECTED]
+44 (0) 20 7253 6372
Try out Resolver One! <http://www.resolversystems.com/get-it/>
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5467329.
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