ModuleNotFound in model linearization

Line 1751 in bd17a66

from linearized_model import linearized_model

I ran a script file and had the problem of ModuleNotFound when importing linearized_model.

My solution is to modify __init__.py and append the analysis folder to sys.path

sys.path.append(os.path.dirname(linearFile))
from linearized_model import linearized_model

@PT-Traviresta

@PT-Traviresta usually it should not be problem because the session is running in the directory where the linearized file is created

@arun3688

@arun3688

If I run the script line-by-line in the interactive mode, there's no problem. But if I run it in the script mode, the error occurs.

My colleague also faced the same problem.

@PT-Traviresta

@PT-Traviresta the issue is fixed with this commit 59ff73b, Thanks for the contribution, i will close this issue, please open the issue in case you face any problem

I get the same error on python 3.13.2 with OMPython 3.6.0

@syntron

@syntron can you please test this. I believe this should work in master after the changes you have done.

@martinscripts

@martinscripts could you please re-test with the latest version? This should not happen at all as the linearized file is no longer imported!

For the old version - 3.6.0 - the error is still valid as the change was merged after this!

@syntron

Hey @syntron,

I am on v3.6.0 and python 3.13.2 and in OMPython's pyproject.toml it says version = "3.6.0", so that seems to be the latest one?

Which version should I install instead?

here my mwe:

from OMPython import OMCSessionZMQ
from OMPython import ModelicaSystem
omc = OMCSessionZMQ()
model_path=omc.sendExpression("getInstallationDirectoryPath()") + "/share/doc/omc/testmodels/"

mod1 = ModelicaSystem(model_path + "BouncingBall.mo","BouncingBall")
mod1.linearize()

output:

SyntaxError                               Traceback (most recent call last)
File c:\Users\mfranke\Documents\projects\general_python\.venv\Lib\site-packages\OMPython\__init__.py:1776, in ModelicaSystem.linearize(self, lintime, simflags)
   1773 try:
   1774     ## do not add the linearfile directory to path, as multiple execution of linearization will always use the first added path, instead execute the file
   1775     ## https://github.com/OpenModelica/OMPython/issues/196
-> [1776](file:///C:/Users/mfranke/Documents/projects/general_python/.venv/Lib/site-packages/OMPython/__init__.py:1776)     module = importlib.machinery.SourceFileLoader("linearized_model", linearFile).load_module()
   1777     result = module.linearized_model()

File <frozen importlib._bootstrap_external>:680, in _check_name_wrapper(self, name, *args, **kwargs)

File <frozen importlib._bootstrap_external>:1207, in load_module(self, fullname)

File <frozen importlib._bootstrap_external>:1031, in load_module(self, fullname)

File <frozen importlib._bootstrap>:537, in _load_module_shim(self, fullname)

File <frozen importlib._bootstrap>:966, in _load(spec)

File <frozen importlib._bootstrap>:935, in _load_unlocked(spec)

File <frozen importlib._bootstrap_external>:1022, in exec_module(self, module)

File <frozen importlib._bootstrap_external>:1160, in get_code(self, fullname)
...
-> [1786](file:///C:/Users/mfranke/Documents/projects/general_python/.venv/Lib/site-packages/OMPython/__init__.py:1786)         raise Exception("ModuleNotFoundError: No module named 'linearized_model'")
   1787 else:
   1788     errormsg = self.getconn.sendExpression("getErrorString()")

Exception: ModuleNotFoundError: No module named 'linearized_model'

By latest version we mean installing OMPython from latest source https://github.com/OpenModelica/OMPython?tab=readme-ov-file#via-source

ok, thanks.

I did pip install git+https://github.com/OpenModelica/OMPython.git now, which I assume should do the same?

With the same mwe from above, I now get

ModelicaSystemError                       Traceback (most recent call last)
Cell In[1], [line 7](vscode-notebook-cell:?execution_count=1&line=7)
      4 model_path=omc.sendExpression("getInstallationDirectoryPath()") + "/share/doc/omc/testmodels/"
      6 mod1 = ModelicaSystem(model_path + "BouncingBall.mo","BouncingBall")
----> [7](vscode-notebook-cell:?execution_count=1&line=7) mod1.linearize()
      9 # plt.plot([1,2,3])
     10 # plt.savefig('test_before.png')
     11 # plt.show()
   (...)     15 # plt.savefig('test_after.png')
     16 # plt.show()

File c:\Users\mfranke\Documents\projects\general_python\.venv\Lib\site-packages\OMPython\ModelicaSystem.py:1672, in ModelicaSystem.linearize(self, lintime, simflags, simargs, timeout)
   1669 linear_file = self.getWorkDirectory() / "linearized_model.py"
   1670 linear_file.unlink(missing_ok=True)
-> [1672](file:///C:/Users/mfranke/Documents/projects/general_python/.venv/Lib/site-packages/OMPython/ModelicaSystem.py:1672) returncode = om_cmd.run()
   1673 if returncode != 0:
   1674     raise ModelicaSystemError(f"Linearize failed with return code: {returncode}")

File c:\Users\mfranke\Documents\projects\general_python\.venv\Lib\site-packages\OMPython\ModelicaSystem.py:279, in ModelicaSystemCmd.run(self)
    277 path_bat = self._runpath / f"{self._model_name}.bat"
    278 if not path_bat.exists():
--> [279](file:///C:/Users/mfranke/Documents/projects/general_python/.venv/Lib/site-packages/OMPython/ModelicaSystem.py:279)     raise ModelicaSystemError("Batch file (*.bat) does not exist " + str(path_bat))
    281 with open(file=path_bat, mode='r', encoding='utf-8') as fh:
    282     for line in fh:

ModelicaSystemError: Batch file (*.bat) does not exist C:\Users\mfranke\AppData\Local\Temp\tmph422rspr\BouncingBall.bat

@syntron

@syntron is this because of some latest changes in working directory handling? The model.bat file should be created.

@martinscripts any idea which OpenModelica version you are using? Can you show us which files are generated in C:\Users\mfranke\AppData\Local\Temp\tmph422rspr

@martinscripts

@martinscripts i guess you are using older OpenModelica version, if i remember it correctly OpenModelica 1.23 or earlier version generates linearization file with different pattern, I guess the new changes might have removed the check for older openmodelica version i guess, if that is the case please install the latest openmodelica version and test it

Hey, yes, you are right, I am on OM 1.18, so quite old.
I am not able to test it with the new versin right now, but I find your explanation plausible. If it persists for newer versions in the future, we can still reconvene.
Thank you and best regards

Hey, yes, you are right, I am on OM 1.18, so quite old.
I am not able to test it with the new versin right now, but I find your explanation plausible. If it persists for newer versions in the future, we can still reconvene.
Thank you and best regards

With the newer version this should work by default, So I will close this issue, please reopen it incase if you face problems with the latest openmodelica version

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ModuleNotFound in model linearization #196

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arun3688 commented on Feb 28, 2024

PT-Traviresta commented on Feb 29, 2024

arun3688 commented on Feb 29, 2024

martinscripts commented on Aug 19, 2025

adeas31 commented on Aug 19, 2025

syntron commented on Aug 19, 2025

martinscripts commented on Aug 20, 2025

adeas31 commented on Aug 20, 2025

martinscripts commented on Aug 20, 2025

adeas31 commented on Aug 20, 2025

arun3688 commented on Aug 20, 2025

martinscripts commented on Aug 20, 2025

arun3688 commented on Aug 20, 2025

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