Why can't I use a variable to specify a page name field?

rescobar — Sat, 09 Nov 2024 00:44:34 GMT

I have the below code to export a map series into multiple PNGs. On line 13, I'm getting an error "AttributeError: 'pageRow' object has no attribute 'page_name_field'"

When I run the script, I input the name of the field as a string, in this case "PageNumber." However, when I run this by just putting "pageName = ms.pageRow.PageNumber" it runs correctly. Is there a reason I can't use a variable in this case?

import arcpy import os import sys aprx = arcpy.mp.ArcGISProject("CURRENT") layout_input = arcpy.GetParameterAsText(0) resoultion_input = int(arcpy.GetParameterAsText(1)) output_folder = arcpy.GetParameterAsText(2) page_name_field = arcpy.GetParameterAsText(3) lyt = aprx.listLayouts(layout_input)[0] ms = lyt.mapSeries for pageNum in range(1,ms.pageCount +1): ms.currentPageNumber = pageNum pageName = ms.pageRow.page_name_field arcpy.AddMessage(f"Exporting {pageName}") lyt.exportToPNG((os.path.join(output_folder, f'Ex2_{pageName}.png')), resolution = resoultion_input)

Re: Why can't I use a variable to specify a page name field?

Luke_Pinner — Sat, 09 Nov 2024 05:28:24 GMT

Because when you are trying to use ms.pageRow.page_name_field, python is looking for an attribute in the pageRow object literally called page_name_field which does not exist. You can use python's getattr() function to dynamically evaluate the variable. E.g.

pageName = getattr(ms.pageRow, page_name_field)

Re: Why can't I use a variable to specify a page name field?

rescobar — Tue, 12 Nov 2024 16:39:09 GMT

Thanks, this worked!

topic Why can't I use a variable to specify a page name field? in ArcGIS Pro Questions

Why can't I use a variable to specify a page name field?

Re: Why can't I use a variable to specify a page name field?

Re: Why can't I use a variable to specify a page name field?