Import matlab.engine error

In Matlab script I am trying to create a Python object that holds reference to the Matlab session. To do that I am passing shared engine name to Python object constructor and trying to find matlab instance using matlab.engine library. During library importing Python raises an exception:

>> py.importlib.import_module('task_monitor')
   Error using enginesession>__init__ (line 8)
   Python Error: EngineError: MATLAB process session cannot be initialized.
   Error in __init__><module> (line 80)
   _session = EngineSession()
   Error in task_monitor><module> (line 1)
   import matlab.engine
   Error in __init__>import_module (line 37)
       __import__(name)

Python class definition

import matlab.engine

class TaskMonitor:

def __init__(self, matlabName):
    try:
        self.matlabEngine = matlab.engine.connect_matlab(matlabName)
    except matlab.engine.EngineError as err:
        print('Could not connect to Matlab: ' + str(err))

Matlab script creating Python object

function init()
  if ~matlab.engine.isEngineShared
      matlab.engine.shareEngine;
  end
  sessionName = matlab.engine.engineName;
  global monitor;
  monitor = py.task_monitor.TaskMonitor(sessionName);
end

When I try to instantiate TaskMonitor in Python's console everything's fine and the object s being created. Is it somehow different while creating it from within Matlab console?

Looks like importing matlab.engine in Python script that's run from within Matlab is not working well.

[Marc-Antoine]

I have exactly the same issue! Help would be appreciated!

[Tomasz Wyrowinski]

The issue was also reported in that question:

Usage of "Matlab python engine" from python executed by Matlab

[Christian Dreher]

I have the same issue and would really appreciate any help.

Answer 1

[Isaac Lenton]

I'm not sure about a safe workaround, but something that seems to work is removing the _session = EngineSession() line and corresponding cleanup line in the matlab.engine init script. Not sure how safe this is, but it seems to work.