Why Do I Get an Error When Returning Multiple Values from a Python Package Compiled Using MATLAB R2024b?

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MathWorks Support Team
MathWorks Support Team on 20 Mar 2025
Answered: MathWorks Support Team on 21 Mar 2025

I am using a MATLAB function LA_Env_reset within a Python script, which is supposed to return four values: state_1, state_2, state_3, and state_4. I have successfully compiled the MATLAB function into a Python package using MATLAB Compiler SDK and performed initial tests. However, when I attempt to call the function with:

s1, s2, s3, s4 = la_env.LA_Env_reset(la_env_obj, seed, snrdb)

I encounter the following error

TypeError: cannot unpack non-iterable float object

It seems that only one value is being returned instead of four. How can I resolve this issue to retrieve all four expected values?

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Accepted Answer

MathWorks Support Team
MathWorks Support Team on 20 Mar 2025
The default behavior of the MATLAB-Python integration is to expect a single output argument from the function call. To retrieve multiple output values, you need to explicitly specify the number of expected outputs using the nargout parameter in your function call.
To resolve the issue, modify your function call to include nargout=4 like this:
s1, s2, s3, s4 = la_env.LA_Env_reset(la_env_obj, seed, snrdb, nargout=4)

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