Labview + Python

[Sly_Nguyen]

How can I configure the return value of a Python Node in LabVIEW to output two values?

My python code is very simple

def calculate_sum_difference(num1, num2😞

    sum_result = num1 + num2

    difference = num1 - num2

    return sum_result, difference

[Basjong53]

Your python script returns a tuple: 

return sum_result, difference

The LabVIEW code should reflect this by wiring a cluster to represent the python tuple type:

[Sly_Nguyen]

Could you please show me where to find these two blocks?

[Basjong53]

It is a cluster of 2 numeric constants

Please read this carefully before proceeding: 

https://www.ni.com/en/support/documentation/supplemental/08/labview-arrays-and-clusters-explained.ht...

[Sly_Nguyen]

Thank you for your help, I have completed it

[Sly_Nguyen]

I added code to be able to log every time it runs. When using LabVIEW, an error occurs; can you please take a look to help me?

[Basjong53]

Well, your python function returns a list... Which I don't think you want, since error_code is a number and result a string (shouldn't this be a boolean?)

Remove the [ ] from the return line. Then make sure that the order of you LabVIEW cluster is the same as your python tuple.

[avogadro5]

Looks like your python code returns number, string and the LabVIEW code expects string, number. Order needs to match.

[Sly_Nguyen]

Thanks for the help, I got it running. But only when running python log appears. What do I need to install for labview to be able to have log when changing reference values

[avogadro5]

The file is probably being created just not where you expect. Because you didn't specify a full path python is treating "log.txt" as a path relative to the working directory. Try an absolute path like "c:/log.txt" assuming Windows. Don't forget to escape the /, put "c://log.txt"

No idea where the working directory is in a python node...