04-02-2021-Carpentry-for-HGIS/02_Day_2_Python_GIS/exercise/B0_exercise1_qgis

[utterances-bot]

Running someone else’s Python script — Python essentials for GIS learners

https://the-magnificents.github.io/04-02-2021-Carpentry-for-HGIS/02_Day_2_Python_GIS/exercise/B0_exercise1_qgis.html

[cforgaci]

Nice, a button appears under the "help" menu! As it only stays there for the current session, how can you make a such button permanent?

[jurra]

Hi @cforgaci, the reason why it is not permanent is because you need to run the script, to make it permanent I would assume you would have to make a plugin or something similar, so that it runs automatically everytime qgis is launched.

You would have to tell qgis somehow to run this script on every start. I don't know how to do that, but I assume it should be possible.

[communisker]

My QGIS version is 2.18.4, after running the gis.buttom.py, the console showed an error message:

Traceback (most recent call last): File "", line 1, in File "//tudelft.net/staff-homes/G/yygan/Desktop/pre_workshop_files-master/qgis/gis_button.py", line 6, in website_action = QAction('Go to gis.stackexchange') NameError: name 'QAction' is not defined

[LCarvalhoF]

I got the same error as Cinco, I have the same version of Qgis

[aecryan]

Hmm, yes my guess is that the issue comes from the fact that this script was written for QGIS version 3, so it may not work the same on version 2. I will do a little research to see if there's a quick change we can make so that it does work :)

[aecryan]

@communisker and @LCarvalhoF to verify, are you opening this python script from your QGIS Python Code Editor? You will get an error if you try running it in the terminal...so I just wanted to double check. It looks like the QAction method is available in QGIS version 2, so that shouldn't be the error.

The workflow is:

1. Open QGIS
2. Open the Python console (Plugins > Python console), then the Code Editor (little button that looks like a piece of paper with a pencil on the top of the Python Console)
3. Open gis_button.py (button on top of code editor that looks like an open folder)
4. Hit play button

Can you try those steps and let me know if it works?

[aecryan]

This is an important point that we touched upon just briefly this morning - scripts written specifically for QGIS will not work outside of QGIS without some special formatting changes (or libraries that do it automatically). For now, we can run everything in QGIS.

[LCarvalhoF]

I followed exactly the same steps and still get the same error.

[aecryan]

@LCarvalhoF can you jump back into the office hours Zoom and we can take a look?