OpenSim Python Scripting

[Carmichael Ong]

Here are steps that work on my M1 machine using miniconda, on OSX 13.2.1

Create, activate, and install opensim in new environment (this worked for me with 3.7, 3.8, 3.9, 3.10)

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conda create -n opensim_py38 python=3.8
conda activate opensim_py38
conda install -c opensim-org opensim

Then when I launch python (typing 'python' in the terminal window), 'import opensim' works for me with no errors.

I could replicate the "no module" issue, but only if I tried python 3.11. This I think makes sense since there is no python 3.11 build on conda yet: https://anaconda.org/opensim-org/opensim/files

[Mazen Al Borno]

Thanks Carmichael. These exact lines you posted did not work with me ("No module name opensim" error). However, it is with osx 12.3.

I was able to fix the problem with the student's computer by adding these lines:
import sys
osim_path = 'D:/Dokumente/Programme/OpenSim/opensim-core/sdk/Python'
sys.path.insert(0,osim_path)
import opensim as osim

all the best,

Mazen

[Mohammadreza Rezaie]

Hi, I'm a windows user with Python 3.9.16. When I try to install OpenSim or Moco via conda, wrong build (py38np120) would be installed and finally, the same error ("No module name opensim")
My fix was to, first, ask conda to look for all available opensim versions and builds:

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conda search -c opensim-org opensim

Which prints:

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Loading channels: done
# Name		Version		Build		Channel
opensim		4.4		py37np120	opensim-org
opensim		4.4		py38np120	opensim-org
opensim		4.4		py39np120	opensim-org

Then, follow this template and install the correct build:
conda install -c <channel> <package_name>=<version>=<build_string>

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conda install -c opensim-org opensim=4.4=py39np120

Hope this helps,
Mohammadreza

[Jia Na]

Thanks Mohammadreza. I finally solve the by combining Mohammadreza and Carmichael's experience.

Here are my solution:

Mac M1 13.2.1
python 3.8.8

step1&2&3:

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conda create -n opensim_py38 python=3.8
conda activate opensim_py38
conda search -c opensim-org opensim

then you can see:

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Loading channels: done
# Name                       Version           Build  Channel             
opensim                        0.1.0  py37hf15cd22_1  opensim-org         
opensim                          4.4      py310np121  opensim-org         
opensim                          4.4       py37np121  opensim-org         
opensim                          4.4       py38np121  opensim-org         
opensim                          4.4       py39np120  opensim-org         
opensim                          4.4       py39np121  opensim-org         

step4:
install opensim according to your python version, here I choose py38np121

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conda install -c opensim-org opensim=4.4=py38np121

--------finish installation-------
all the best,
Jia

[Mazen Al Borno]

Thanks Mohammadreza and Jia.

Just a question for the community: I have two students (one on Mac M1 and one on Windows) where they have successfully installed Opensim on their computers, but the Simbody GUI does not show up when running their code (after "model.setUseVisualizer(True)"). I remember seeing this before, but don't remember the fix...

all the best,

Mazen