importlib.reload(matlab.engine) is not working - MATLAB Answers

link管理

链接快照平台

输入网页链接，自动生成快照
标签化管理网页链接

相关文章推荐

爱看书的汽水 · 系统要求：运行 COMSOL App· 4 周前 ·

爱笑的脸盆 · MATLAB代码显示内存不足的解决方法_ma ...· 2 周前 ·

果断的电池 · 逻辑分析仪内存不足? “拼”出解决之道! ...· 2 周前 ·

热情的柿子 · [培训]MATLAB编程技巧及代码加速—释放 ...· 2 周前 ·

怕考试的日记本 · MATLAB的内存不足但不应该 - · 2 周前 ·

礼貌的高山 · 解析XML | HaHack· 3 月前 ·

读研的水煮鱼 · Intopia launches WCAG ...· 6 月前 ·

高兴的烈酒 · Google test的使用 | Ivanzz· 9 月前 ·

坏坏的雪糕 · 如何自动语法高亮整个Quill编辑器中不含代 ...· 11 月前 ·

乐观的香菜 · 中南大学采购与招标管理中心-地方性法规· 1 年前 ·

https://se.mathworks.com/matlabcentral/answers/1438999-importlib-reload-matlab-engine-is-not-working

Hey,

I try to switch the python engine version in one single class. I added here a small example. Based on the used matlab version I want do add matlab.engine version dynamically. I tested many ways - importlib.reload(<matlabVersion>) is not working. What is the best way

       
         import
        
         sys
        
         import
        
         re
        
         import
        
         importlib
        
         matlab2017a =
        
         "d:\CodeArea\ModelQualityInterface\core\Tools\MatlabSimulink\matlab17aPy35\Lib\site-packages"
        
         matlab2016b =
        
         "d:\CodeArea\ModelQualityInterface\core\Tools\MatlabSimulink\matlab16bPy35\Lib\site-packages"
        
         sys.path.append(matlab2016b)
        
         import
        
         matlab.engine
        
         print(matlab.
        
         __
        
         file__)
        
         print(matlab.engine.find_matlab())
        
         def
        
         __RemoveMatlabEngineFromSysPath__(deliveredLibs):
        
         for
        
         p in
        
         sys.path:
        
         if
        
         p.find(deliveredLibs) != -1:
        
         sys.path.remove(p)
        
         __
        
         RemoveMatlabEngineFromSysPath__(matlab2016b)
        
         sys.path.append(matlab2017a)
        
         matlab = importlib.reload(matlab.engine)
        
         print(matlab.engine.
        
         __
        
         file__)
        
         print(matlab.engine.find_matlab())
        
         Output:
        
         File
        
         "d:/CodeArea/ModelQualityInterface/core/Tools/MatlabSimulink/test_multipleMatlabVersions.py"
        
         , line
        
         31
        
         , in
        
         <module>MatlabSimulink/test_multipleMatlabVersions.py"
        
         , line
        
         31, in
        
         <module> t__.py"
        
         , line
        
         166
        
         , in
        
         reload
        
         matlab = importlib.reload(matlab.engine)
        
         File
        
         "c:\Program Files\Python35\lib\importlib\__ini_exect__.py"
        
         , line
        
         166
        
         , in
        
         reload 697
        
         , in
        
         exec_module
        
         _
        
         bootstrap.
        
         _
        
         exec(spec, module)
        
         _
        
         call_with_frames_removed
        
         File
        
         "<frozen importlib._bootstrap>"
        
         , line
        
         626
        
         , in
        
         MatlabSimulink\matlab16bPy35\Lib\site-packages\matlab\engine\__init__.py"
        
         , line
        
         80
        
         , in
        
         <module>
        
         _
        
         exec
        
         File
        
         "<frozen importlib._bootstrap_external>"
        
         , lineMatlabSimulink\matlab16bPy35\Lib\site-packages\matlab\engine\enginesession.py
        
         ", line 8, in __init__ 697, in exec_module
        
         File
        
         "<frozen importlib._bootstrap>"
        
         , line
        
         222
        
         , in
        
         not be initialized.
        
         _
        
         call_with_frames_removed el__
        
         of <matlab.engine.enginesession.EngineSession object at 0x00000212C1A2E7B8>>
        
         File
        
         "d:\CodeArea\ModelQualityInterface\core\Tools\MatlabSimulink\matlab16bPy35\Lib\site-packages\matlabMatlabSimulink\matlab16bPy35\Lib\site-packages\matlab\engine\enginesession.py"
        
         , line
        
         14
        
         , in
        
         __del__\engine\__init__.py"
        
         , line
        
         80
        
         , in
        
         <module>
        
         _
        
         session = EngineSession() MatlabSimulink\matlab16bPy35\Lib\site-packages\matlab\engine\enginesession.py
        
         ", line 17, in release
        
         File
        
         "d:\CodeArea\ModelQualityInterface\core\Tools\MatlabSimulink\matlab16bPy35\Lib\site-packages\matlab\engine\enginesession.py"
        
         , line
        
         8
        
         , in
        
         __init__
        
         pythonengine.createProcess()
        
         matlab.engine.EngineError: MATLAB process
        
         session cannot be initialized.
        
         Exception
        
         ignored in: <bound method EngineSession.__del__ of <matlab.engine.enginesession.EngineSession object at 0x00000212C1A2E7B8>>
        
         Traceback (most recent call last):
        
         File
        
         "d:\CodeArea\ModelQualityInterface\core\Tools\MatlabSimulink\matlab16bPy35\Lib\site-packages\matlab\engine\enginesession.py"
        
         , line
        
         14
        
         , in
        
         __del__
        
         self.release()
        
         File
        
         "d:\CodeArea\ModelQualityInterface\core\Tools\MatlabSimulink\matlab16bPy35\Lib\site-packages\matlab\engine\enginesession.py"
        
         , line
        
         17
        
         , in
        
         release
        
         if
        
         self.
        
         _
        
         process_created:
        
         AttributeError:
        
         'EngineSession'
        
         object
        
         has no attribute '_process_created'

https://se.mathworks.com/matlabcentral/answers/1438999-importlib-reload-matlab-engine-is-not-working#comment_2263350

https://se.mathworks.com/matlabcentral/answers/1438999-importlib-reload-matlab-engine-is-not-working#answer_1435556

Hi,

It seems like you are encountering issues when trying to dynamically switch between different versions of the MATLAB engine in Python within a single class. The error you are facing is related to the initialization of the MATLAB process session.To dynamically switch between different versions of the MATLAB engine in Python, you can follow these steps:

1. Use importlib.reload() Correctly:

When reloading a module, you should reload the top-level module, not a specific attribute like matlab.engine.
Instead of "matlab = importlib.reload(matlab.engine)", you should use "matlab = importlib.reload(matlab)".

2. Properly Manage Module Paths:

Ensure that you are correctly managing the module paths when switching between different versions of the MATLAB engine.
Remove the previous MATLAB engine path from "sys.path" before adding the new one.

Hope it helps.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!