topic Re: KeyError in Creating Web Map Inventory in ArcGIS API for Python Questions

KeyError in Creating Web Map Inventory

chintakandel — Wed, 20 Jun 2018 20:18:31 GMT

I am trying to create a web map inventory and encountered a KeyError.

gis = GIS("Portal url", "username", "password")
search_results = gis.content.search(query="tags:streamflow", item_type="Web Map")

l = []
for s in search_results:
   wmo = arcgis.mapping.WebMap(s)
   ops_layers = wmo['operationalLayers']
   basemap_layers = wmo['baseMap']['baseMapLayers']

KeyError: 'operationalLayers'

Any suggestions on how to handle KeyError?

Re: KeyError in Creating Web Map Inventory

JeffBigos — Sun, 12 Dec 2021 08:27:44 GMT

Hi Chintamani,

What version of the api are you using?

you can check by running the following code:

import arcgis

print(arcgis.__version__)

Recently I had something similar and figured things out in the following way:

to get the operational layers as a key from a dictionary I converted the webmap to json as you see below:

wmoJson = wmo.get_data(try_json=True)
wmo['operationalLayers']

Another access point to the operational Layers would be through the layers property
of the webmap class in the api, but access to the property in the webmap class depends on
the version of the api you have:

wmo.layers

arcgis.mapping module — arcgis 1.4.2 documentation 

Let me know if this helps.

Thanks,

Jeff

Re: KeyError in Creating Web Map Inventory

JoshuaBixby — Sun, 12 Dec 2021 08:27:47 GMT

A couple of different ways to alter your code to make it work. Option #1:

gis = GIS("Portal url", "username", "password")
search_results = gis.content.search(query="tags:streamflow", item_type="Web Map")

l = []
for s in search_results:
   wmo = arcgis.mapping.WebMap(s)
   ops_layers = wmo.layers
   basemap_layers = wmo.basemap['baseMapLayers']‍‍‍‍‍‍‍‍

Option #2

gis = GIS("Portal url", "username", "password")
search_results = gis.content.search(query="tags:streamflow", item_type="Web Map")

l = []
for s in search_results:
   wmo = arcgis.mapping.WebMap(s)
   ops_layers = wmo.definition['operationalLayers']
   basemap_layers = wmo.definition['baseMap']['baseMapLayers']‍‍‍‍‍‍‍‍

Re: KeyError in Creating Web Map Inventory

chintakandel — Mon, 09 Jul 2018 13:18:53 GMT

Hi Jeff,

Thank you for your suggestions to get the operational layers as a key from

a dictionary.

I am using 1.4.2 version.

I have tried to get the operational layers as a key from a dictionary,

still have KeyError:'layerType'.

for s in search_results:

wmo = arcgis.mapping.WebMap(s)

ops_layers = wmo.layers

basemap_layers = wmo.basemap['baseMapLayers']

for op_layer in ops_layers:

d = collections.OrderedDict()

d["Web Map Name"] = s.title

d["Web Map Item ID"] = s.itemid

d["Layer Type"] = "Operational Layer

()".format(op_layer["layerType"]) d["Layer URL"] = op_layer["url"] l.append(d) for base_layer in basemap_layers: j = collections.OrderedDict() j["Web Map Name"] = s.title j["Web Map Item ID"] = s.itemid j["Layer Type"] = "Basemap Layer ()".format(base_layer["layerType"])

j["Layer URL"] = base_layer["url"]

l.append(j)

Thanks again,

Chintamani

Re: KeyError in Creating Web Map Inventory

JeffBigos — Sun, 12 Dec 2021 08:27:50 GMT

Chintamani,

Looking through the code you have provided I see something that could be causing empty operational layers in the resulting dictionary:

in your format function change the () to { } as you see below

d["Layer Type"] = "Operational Layer{}".format(op_layer["layerType"])

Another spot I see that is on the following line:
j["LayerType"] = "BasemapLayer{}".format(base_layer["layerType"])
Try out that change and let me know how it goes.

Thanks, 

Jeff

Re: KeyError in Creating Web Map Inventory

chintakandel — Thu, 12 Jul 2018 18:58:07 GMT

Hi Jeff,

Thank you for your suggestions. I have changed my format function but still

encounter a layerType keyError.

Best regards,

Chintamani

Re: KeyError in Creating Web Map Inventory

JeffBigos — Fri, 13 Jul 2018 16:23:56 GMT

Hi Chintamani,

In your code above, I see 2 spots where you are using the layer type key:

1. d["Layer Type"] = "Operational Layer{}".format(op_layer["layerType"])

2.j["LayerType"] = "BasemapLayer{}".format(base_layer["layerType"])

when you see the error which of those lines is the error occurring with?

Thanks,

Jeff

Re: KeyError in Creating Web Map Inventory

JoshuaBixby — Fri, 13 Jul 2018 17:26:51 GMT

Have you tried either of my suggestions? If so, did either work?

Re: KeyError in Creating Web Map Inventory

chintakandel — Fri, 13 Jul 2018 18:09:34 GMT

Hi Jeff,

layerType error occurs with both lines ( Operational Layer and

BasemapLayer).

Code extracts all other information except layer type.

Thanks again,

Chintamani

Re: KeyError in Creating Web Map Inventory

JeffBigos — Mon, 16 Jul 2018 15:19:58 GMT

Hi Chintamani,

I am able to use the code you provided to get all the information you are looking for in the webmaps including the layerType key. If you try the code on another webmap are you able to get the code to work through that layer type key?

In testing the code above I have been stepping through the code in my debugger. That is a nice way to gain insight into the responses and the values being returned.

Take a look at the above and let me know what you get.

Thanks,

Jeff

Re: KeyError in Creating Web Map Inventory

JeffBigos — Mon, 16 Jul 2018 15:21:13 GMT

Hi Joshua,

I tested out the code that you provided and it works on my end.

It's good to see that you can access these properties in 2 different ways.

Thanks,

Jeff

Re: KeyError in Creating Web Map Inventory

chintakandel — Tue, 17 Jul 2018 12:55:05 GMT

Hi Jeff,

Thank you. I will test it to my another web map.

Thanks again,

Chintamani

Re: KeyError in Creating Web Map Inventory

chintakandel — Wed, 18 Jul 2018 21:10:11 GMT

Thanks Jeff. It works for my other web maps. Greatly appreciated your

cooperation.

Regards,

Chintamani

Re: KeyError in Creating Web Map Inventory

AlistairFox — Sun, 09 Sep 2018 00:10:42 GMT

why does under 1.5 i now get this keyerror for opedrational layers. I'm using the same code and loading in the same webmap json from file. But the dictionary does not contain any operationallayer keys after the json file has been loaded in. what changed at 1.5?

for subdir, dirs, files in os.walk(rootdir3):
for file in files:
#print (os.path.join(subdir, file))
print("processing: " + file)

#modify existing web map
web_map_json = str()

# read a previously downloaded and saved web map json from text file
# store each template json file in a seperate folder from the gdb files. Loop through all the templates in each country
with open(os.path.join(subdir, file),"r") as file_handle:
web_map_json = json.load(file_handle)

# publish a new web map setting some attributes and using the json as input
# will need a title and snippet for each country to be somewhere in a list
web_map_item_properties = {'title':file[:-5],
      'type':'Web Map',
      'snippet':'This map shows a Template Map',
      'tags':'ArcGIS Python API',
      'text':json.dumps(web_map_json)}

# add to the portal
web_map_item = gis.content.add(web_map_item_properties)

# create a web map object out of the item
web_map_obj = arcgis.mapping.WebMap(web_map_item)

layer_list = web_map_obj['operationalLayers']

***get KeyError for above line

Re: KeyError in Creating Web Map Inventory

JoshuaBixby — Sun, 09 Sep 2018 14:45:34 GMT

Even using 1.4.x, I never got the approach of web_map_obj['opertionalLayers'] to work, which is why I posted two alternative methods to access the operational layers. The current arcgis.mapping module — arcgis 1.5.0 documentation for WebMap states operational layers should be accessed via the layers property (option #1 that I posted):

layers
Operational layers in the web map :return: List of Layers as dictionaries