No module named '_bpy' when using python multiprocessing?

3di · April 4, 2021, 11:12am

This looks like it’ll fix it:

github.com/TylerGubala/blenderpy

ImportError: No module named '_bpy' When Pickling

opened 09:05AM - 23 Jul 19 UTC

closed 03:51PM - 26 Jul 19 UTC

HCAWN

question wontfix documentation

**Describe the bug** I have a script that splits in to a multiprocess.pool(). I… require the bpy module both before the pool and inside each thread in the pool. I can get bpy to function outside or inside but not both. There are three things main methods I've tried: 1. `import bpy` at the start of the script outside of `if __name__ == '__main__' :` this causes `ImportError: No module named '_bpy'` - I presume because it's trying to import bpy multiple times 2. `import bpy` inside of `if __name__ == '__main__' :` this works for outside the `pool` but if I want to parse the module into the pool, I have to pickle it via `dill` and then unpickle it inside each thread which also results in `ImportError: No module named '_bpy'` 3. `import bpy` inside of `if __name__ == '__main__' :` and then inside each thread: same error comes up as above, once again I think this is because I'm trying to import it more than once. **To Reproduce** Steps to reproduce the behaviour: example when pickling and unpickling: ```python import bpy import dill as pickle #pickle bpy module manually with open('bpydill', 'wb') as file: pickle.dump(bpy, file) #unpickle bpy module when inside thread with open('bpydill', 'rb') as file: bpy = pickle.load(file) ``` **Expected behavior** `dill` module has the ability to pickle modules and so should be able to parse the module into each thread. I understand that `_bpy` is a special part of the module that is compiled into blender and you've done some great trick to even get it to work. **Desktop (please complete the following information):** Windows 10 Pro 64 python 3.6.6 **Additional context** Would be great if you know of another way I can get bpy to work inside and outside of the `pool` aside from pickling or importing multiple times.l

I wonder if Blender could be doing things better here.

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No module named '_bpy' when using python multiprocessing?