How to list which feature layers are being used by which web maps and apps?

[ConorMacNaughton]

Anybody got any tips or hints on how this can be done?

I've been able export lists of items by user and user folder using the following:
pd.DataFrame(list_items).transpose().to_excel(str(user.username)+'.xlsx')

But it would be more useful to see which web maps and web apps throughout my organization are using which feature layers.

[DavidPike]

I'm still learning this one myself, quite painfully in fact...

Accessing and creating content | ArcGIS for Developers 

Working with web maps and web scenes | ArcGIS for Developers 

here's what I could glean from the documentation (such as it is..)

from arcgis.gis import GIS
from arcgis.mapping import WebMap

gis = GIS(url='https://pythonapi.playground.esri.com/portal', 
username='arcgis_python', 
password='amazing_arcgis_123')

search_my_contents = gis.content.search(query="owner:[owner name]", 
item_type="Web Map", max_items = 1000)

#create web map objects from search results and print the web map title and layer name
for webmap_item in search_my_contents:
    webmap_obj = WebMap(webmap_item)
    for layer in webmap_obj:
        print(webmap_item.title, layer.title)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

[ConorMacNaughton]

Thanks! This worked for me after the following change to line 14:
 

for layer in webmap_obj.layers:

[JosephRoberts2]

Hi David, 
Have you figured out how to access the properties of a sublayer of a service?  For instance, I'm iterating through a map that has the entire service. When my script hits this layer, it does not iterate through the sublayer of the services. It simply prints the name of the main service.

Any insight would be greatly appreciated.