Dissolve ArcGIS Pro Python doesn't take string variable for field list

Question

I try to dissolve layer having multiple fields statistics calculated. I prepared a string variable which has all the information in it. When I paste printed variable into dissolve it works. However I'm not able to use the variable itself. EDIT: OutFields is string.

Variable:

print(OutFields)
[[Fields_i[0], "SUM"],[Fields_i[1], "SUM"],[Fields_i[2], "SUM"],[Fields_i[3], "SUM"],[Fields_i[4], "SUM"],[Fields_i[5], "SUM"],[Fields_i[6], "SUM"],[Fields_i[7], "SUM"]]

It works this way:

arcpy.Dissolve_management(IntPolygon, OutPolygon, ToID, [[Fields_i[0], "SUM"],[Fields_i[1], "SUM"],[Fields_i[2], "SUM"],[Fields_i[3], "SUM"],[Fields_i[4], "SUM"],[Fields_i[5], "SUM"],[Fields_i[6], "SUM"],[Fields_i[7], "SUM"]], "", "")

And it doesn't this way:

arcpy.Dissolve_management(IntPolygon, OutPolygon, ToID, OutFields, "", "")

Bera · Accepted Answer · 2020-03-31 10:37:13Z

1

If it works when you pass a list of lists [[Fields_i[0], "SUM"],[...

But not with a string representation of a list of lists:

"[[Fields_i[0], "SUM"],[F.." #Fields_i[0] inside a string wont work/fetch correct fieldname.

Then pass a list of lists. Try something like this:

import arcpy

fc = r'C:\somedb.gdb\somedata'

Fields_i = [f.name for f in arcpy.ListFields(dataset=fc)] #Or whatever way you list your fields

OutFields = [[Fields_i[j], "SUM"] for j in range(0,8)]

Then dissolve

arcpy.Dissolve_management(IntPolygon, OutPolygon, ToID, OutFields, "", "")

edited Mar 31, 2020 at 10:37

answered Mar 31, 2020 at 9:15

Bera

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