refreshing the python script engine

If I import a python module into the GhPython component, using a python "import" statement, the python engine doesn't seem to ever reevaluate that module unless I restart Rhino. It seems to cache the imported module until Rhino is restarted. Closing Grasshopper does not help.

If I change the inputs to the ghPython component, the module's value is not updated.

Even if I remove the module's path from sys.path, set the module's value to None and re-import it, the module still has the same cached value and does not update

Even if I delete the module and do the above, it does not change the module's value in the ghPython component.

Also, deleting the GhPython only ghPython component on the canvas and rewriting the script does not help. Nor does closing and reopening the grasshopper file.

This makes it a huge pain to develop any sort of external python module that works with python in Grasshopper. Grasshopper could make a great test environment for python packages generally, because the inputs can be changed dynamically, but my inability to update a module is really preventing progress.

Is there a way to manually refresh the module in a script?

Replies to This Discussion

Permalink Reply by Giulio Piacentino on September 29, 2013 at 7:07pm

Hello Ben
Sorry if I'll be quick, I'm in Berlin for the Design Modeling Symposium.

Have you tried the reload(module_variable) function?

Giulio

Permalink Reply by Benjamin Golder on September 29, 2013 at 8:49pm

Hi Giulio,

I had forgotten that. Thank you for reminding me.

I tried it, but it does not work either.

Permalink Reply by konrad k sobon on December 2, 2014 at 3:26pm

Benjamin,

Have you solved this issue? Some one year later i am running into exactly the same thing. Ideas?

Thank you,

Permalink Reply by djordje on December 2, 2014 at 4:24pm

Hi Konrad,

I have been using Giulio's solution for some time.
You just have to add the reload function after your import call:

import somemodule
reload(somemodule) # insert additionally, once your somemodule.py file has been changed

# do something...

Permalink Reply by Samuel Eliasson on December 3, 2014 at 3:14am

Hi Dordie,

But does that mean that you have to add a reload function in the ghPython component for every time that the "somemodule.py" has been changed or did I misunderstand something? Sounds like an big effort...

Thanks,

Samuel

Permalink Reply by djordje on December 3, 2014 at 7:11am

No, you just add it once. In this way each time you change something in your module.py file, the module would be reloaded.

Permalink Reply by Giulio Piacentino on December 4, 2014 at 7:53am

Yes, that's what I would do, too. Just keep it there while I am editing my code. Once I am done, remove the line...

Giulio
--
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

Permalink Reply by Samuel Eliasson on December 4, 2014 at 8:13am

thanks

Samuel

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