Error - MATLAB expression <output of myfunc> is not numeric

I am trying to pass a value from the python code to the Matlab function in simulink and I am getting the following error:

Error - MATLAB expression <output of myfunc> is not numeric.

Matlab function -

function y = fcn
    y = 0; 
    coder.extrinsic('py.throttle.test') 
    y = py.throttle.test();
end

Python code(throttle.py)

def test():
    throttle = 5
    return throttle

any idea how this could be solved?

[Walter Roberson]

What is showing up for class(y) after the execution of the py.throttle.test() call ?

I am not clear on which point is giving the error?

Try

    y = uint64(0); 

[Mario Malic]

If you call from the Command Window

y = fcn

Would y be Python list variable type? You'll need to convert it to numeric array, check here.

[Walter Roberson]

No, from the command window, y comes out as uint64 .

[ARUN]

y = py.throttle.test(); this the point, I am getting a error as Output of y is non numeric

[Walter Roberson]

Which MATLAB release are you using, and which operating system?

[ARUN]

I am using MATLAB R2020b and Windows 10

[Walter Roberson]

filename = 'throttle.py';
[fid, msg] = fopen(filename, 'wt');
if fid < 0
    error('Failed to open file "%s" because "%s"', filename, msg);
end
fprintf(fid, 'def test():\n');
fprintf(fid, '    throttle = 5\n');
fprintf(fid, '    return throttle\n');
fclose(fid)

ans = 0

y = py.throttle.test();
class(y)

ans = 'int64'

disp(y)

   5

It works when I test on Mac or in MATLAB Online (which is Linux)