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I am working on updating a Python 2 script (arcpy.mapping) to a Python 3 script (arcpy.mp).

I've successfully updated the following:

aprxFile=r"G:\usr\Drinking Water Programs\Monroe 2023-02\Maps\ProMap.aprx" #aprx document
arcpy.env.overwriteOutput = True
aprx = Map.ArcGISProject(aprxFile)
layout = aprx.listLayouts('DWP_Maps_5')[0]
noteStat = layout.listElements("TEXT_ELEMENT","Note_statistic")[0]
noteStat.text = "Mapped value is the average for the "+unit
noteTreat = layout.listElements("TEXT_ELEMENT", "Note_treated")[0]
noteTreat.text = "Treated samples not mapped"
noteAny = layout.listElements("TEXT_ELEMENT", "Note_any_sample")[0]
noteAny.text = " "
notePerDist = layout.listElements("TEXT_ELEMENT", "Note_Distribution_per_unit")[0]
notePerDist.text = " "
notePerNum = layout.listElements("TEXT_ELEMENT", "Note_Numbers_per_unit")[0]
notePerNum.text = " "

The next part not so successfully:

dfList = aprx.listMaps(aprx)
baseMCD1 = dfList.listLayers("MCD_light") #new code
baseMCD2 = Map.listLayers(aprx,"MCD_medium",dfList[0])[0] #old code

I get the following error:

AttributeError Traceback (most recent call last) In [37]: Line 84:
baseMCD1 = dfList.listLayers("MCD_light")

AttributeError: 'list' object has no attribute 'listLayers'

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  • 1
    You are trying to use arcpy.mapping sytax with arcpy.mp. For example, aprx.listMaps(aprx) isn't going to return any results. Even after you change the line to dfList = aprx.listMaps(), the next line of code still won't work because listMaps() returns a Python list of Maps in the APRX, and Python lists have no listLayers method, hence the error. You need to either select a map from the Python list or iterate over the whole list and call retrieve the layers of the individual Map objects.
    – bixb0012
    Commented Dec 15, 2023 at 20:01

2 Answers 2

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You are trying to listLayers on the list object of maps. You need to select a map from that list.

Example:

dfList = aprx.listMaps()[0] #First map in list
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You have not included your imports but, in any event, I think you will be writing more readable code if you replace:

aprx = Map.ArcGISProject(aprxFile)

with:

import arcpy

aprx = arcpy.mp.ArcGISProject(aprxFile)
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