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

Question

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) in () 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 · Answer

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.

JoshuaBixby · Answer

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

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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.

MattEnglish · Answer

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/