topic Re: Python: get error message? in Discussions

Python: get error message?

hogi — Wed, 25 Dec 2024 19:03:21 GMT

Python integration in jmp is very useful.

For debugging - when I executing a command in Python via

Python Submit()

and get a return value -1, indicating that something went wrong.

Is there a possibility to get the error message?

e.g. an automatically updated Python variable, which I could get back to JSL via

Python Get(PythonErrorMessage)

#myTop10_2022
-> JMP 18 : )

Re: Python: get error message?

Craige_Hales — Wed, 01 Feb 2023 12:47:17 GMT

I've been told they are working on it. I was able to build Python code with extra try/except to pass unexpected errors back to JMP as an error message. From

Python Init(); // one-time startup...
// 0: startup 
xrc = Python Execute( {}, {By_ID, By_XPATH, rc},
"\[
try:
    from selenium import webdriver
...
    By_XPATH = By.XPATH
    rc = "ok"
except Exception as e:
    rc = repr(e)
]\"
);

If( xrc != 0 | rc != "ok", Throw( "start up Selenium failed" || Try( ": " || Char( rc ), "" ) ) );

I agree, that wrapper should be built into the execute interface. And, as I recall, there was some sort of failure that it doesn't catch, but it made debugging much more enjoyable.

Re: Python: get error message?

hogi — Wed, 01 Feb 2023 14:55:48 GMT

Amazing - thank you so much!

Definitely worth to get into the next release :)
@SamGardner?

For the time being, I will replace all my Python Submit() with Python Try() :)
Please not the single additional indentation in he code to match the try in the Python Try function - especially as this implementation of error forwarding doesn't have a chance to react on indentation errors (as well as all the other errors which are detected before executing the code *).
I guess that Jmp team will implement it in a more robust way ...

*) So, if you have an error message like this

it could be an indentation error. Beware of using the Reformat Script function ;)

Python Init();

Python Try = Function( {code},
xrc = Python Execute(
		{},
		{rc},
"try:" || code || "\[
	rc = "ok"
except Exception as e:
	rc = repr(e)
]\"
	);
	If( xrc != 0 | rc != "ok",
		Throw( "Python error !
" || Try( Char( rc ), "" ) )
	);
);

Python Try( "
	print(0)" );

Python Try( "
	print(xxx)" );
	
Python Term()

Re: Python: get error message?

hogi — Wed, 01 Feb 2023 14:24:38 GMT

Another trick for Python Debugging:

Instead of

Python Submit("\[
Lorem ipsum dolor sit ametERROR IS HERE, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
]\")

split the code off by including it as a package:

Python Submit("
import loremIpsum as li
li()
");

Then you can import the same package in parallel into a pythonText.py file and check if all the functions run as expected.

Then JSL debugging can be reduced to the interface part.

Additional benefit:

You can edit the code of the loremIpsum package in your preferred Python text editor with syntax highlighting and other gimmicks.

Re: Python: get error message?

SamGardner — Mon, 06 Feb 2023 21:16:43 GMT

For now, Wrapping the Python call inside a Try( ) is the best option. This is definitely captured as an issue, and it will require some investigation to see what can be done.

Re: Python: get error message?

Paul_Nelson — Mon, 19 Feb 2024 16:19:16 GMT

As Craige has indicated, use of try: except: is the best option. It's also great programming practice to make a habit.

Very soon we will be unveiling JMP 18 in Manchester. I believe you will be pleasantly surprised. Significant effort has been put into updating and improving the Python integration.

Stay tuned...

Re: Python: get error message?

hogi — Thu, 07 Mar 2024 18:01:16 GMT

Very cool the new smooth integration of Python in Jmp.