topic Re: ArcGIS Python API Sample Notebook "Using Geoprocessing tools" does not work in ArcGIS API for Python Questions

ArcGIS Python API Sample Notebook "Using Geoprocessing tools" does not work

MattEnglish — Sun, 12 Dec 2021 08:29:48 GMT

Hi:

I'm following along with this sample notebook but the following input doesn't seem to produce any output on the map when I click on the map:

def do_analysis(m, g😞

ret = gptool.message_in_a_bottle(g, 150)

for geom in ret:

map.draw(geom)

map.on_click(do_analysis)

The gptool object is returning a 'NoneType':

TypeError  Traceback (most recent call last) 
<ipython-input-24-a0a0d2de3044> in <module>()       
1 ret = gptool.message_in_a_bottle(g,150) 
----> 2 for geom in ret:       
3     map.draw(geom)  TypeError: 'NoneType' object is not iterable

Any insight would be helpful (I'm a newbie to this API)

Cheers,

Matt

Re: ArcGIS Python API Sample Notebook "Using Geoprocessing tools" does not work

JoshuaBixby — Thu, 11 Aug 2016 17:40:33 GMT

Providing a link to the sample notebook would be most helpful.

You have some indentation issues, but I am guessing those are copy & paste artifacts.

Your error message is informing you that your geoprocessing tool returned nothing. When you iterate over the list with a single None object, it generates an error when you try to draw it.

Re: ArcGIS Python API Sample Notebook "Using Geoprocessing tools" does not work

MattEnglish — Thu, 11 Aug 2016 20:13:21 GMT

Try running this notebook and see if you can reproduce the problem - I'm following exactly as it's laid out in the sample:

https://developers.arcgis.com/python/sample-notebooks/Using-Geoprocessing-tools/

Re: ArcGIS Python API Sample Notebook "Using Geoprocessing tools" does not work

JoshuaBixby — Sun, 12 Dec 2021 08:29:50 GMT

I get an error at the very end, but different than your error when I click on the map in various locations:

TypeError Traceback (most recent call last)

TypeError: _handle_map_msg() takes 3 positional arguments but 4 were given

I just downloaded the sample/example Jupyter notebook from Github, and it generates the same error as when I manually type in the code. I will have to dig in a bit deeper.

UPDATE: I found the cause of the error for me, lines 327-329 of viz.py look like this:

def _handle_map_msg(self, _, content):
#def _handle_map_msg(self, _, content, buffers):
     """Handle a msg from the front-end.

The code calling _handle_map_msg() is passing 4 arguments instead of 3. I will have to ask in the beta forums if the function definition is wrong or code calling it.

Re: ArcGIS Python API Sample Notebook "Using Geoprocessing tools" does not work

JoshuaBixby — Sat, 13 Aug 2016 14:18:02 GMT

Heard back from Esri, the function is supposed to have 4 parameters, so one can just comment out the three parameter definition and uncomment the other one until Esri changes the code.