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

[MattEnglish]

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

[JoshuaBixby]

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.

[MattEnglish]

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/

[JoshuaBixby]

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.

[JoshuaBixby]

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.