Issue with Python in LabView: Errors 1761 or 1671

[DrPiti]

Hi everybody,

I am very new to LabVIEW and I am experiencing a very strange problem: Python is not working with my LabVIEW installation, not even the simplest example case. I would really appreciate any help or advice, cause I am messing around with this issue for hours now.

Some information about the system:

I use a 64bit LabVIEW Version 2024 Q1 together with a python 3.9 64bit installation (by Microsoft Appstore). I chose this version, to make sure, that I do not run into a version conflict:

     

Path variables are setup correctly (installation is under C:\users\peter.schmidt\AppData\Microsoft...). From above you can also see, that I can access python via cmd:

echo %Path%:

From my point of view, the installation should be correct. I first tried the examples coming with LabVIEW, none of these worked. Then I created the most simple example ever:

My VI looks as follows:

It just consists of a Python Session On -> Python Node -> Python Session Off. The python code in MyTestFunc.py is:

So this simple Test() Function does not take any arguments and just resturns a float constant 2.2. Running this test VI gives me Error 1761:

It basically seems that LabVIEW does not find the correct python path. However, if I pipe-in the python path, by connecting the string constant (e.g. C:\Users\peter.schmidt\AppData\Local\Microsoft\WindowsApps\python.exe) with the Open Python Session INPUT for python Path:

I will receive Error 1671:

What am I doing wrong? At first I thought it is because I have zero experience in LabVIEW, but even the LabVIEW-Python Examples do not work. Does any know what to check for as a next step?

Is it possible, that the dot in the user name "peter.schmidt" causes an issue?

Many Thanky!

BR,

Peter

[dkfire]

there is an error in you python version string, it should be 3.9 and NOT 3.09

[DrPiti]

Many thanks for the reply! Shame on me, you are right! Unfortunately, that does not fully resolve the issue. With the correct version string, 3.9, I still run into errors:

If I keep the python Path connected, I will receive Error 1761 now:

If I disconnect, e.g. let LabVIEW choose the python path by system path, then I now receive a new Error 1672:

[dkfire]

And you have tried to run your py function in python ?

[DrPiti]

Yes, of course:

I mean, it doesn't do something impressive. I added a print line and called the function (without a call actually nothing will happen) just to see some output and it works fine.

[Andrey_Dmitriev · Accepted solution]

For me it works in this combination and take a note I have default python in PATH 3.11.6, but 3.9.13 also installed and it works:

and also if I'll disconnect full path to python, still working (kind of magic):

only with wrong version raised error 1761:

But I never ever used installation from Microsoft Store. Try to download and install python "normally" from original website.

[DrPiti]

@Andrey_Dmitriev you are a genius!

After completely removing the MS Store Installation and installing it from the link you shared it works properly! I thank you so much!
Crap nuggets, I never considered this a possibility - my bad! 

It seems that MS Store installation messes up to set PATH Variables correctly. 

Thank you so much!
BR,

Peter