IndexError: list index out of range when using UpdateCursor

Question

I am trying to update all values in column in a feature layer in ArcGIS Pro using arcpy.da.UpdateCursor, but I am getting the error: IndexError: list index out of range

I am trying to update all current values in the column "Dist_Next" with the values in the list distance_next_stop, i.e. the first row should be replaced with 19.32..., the second row with 73.84..., etc. The feature layer and the list contains the same amount of rows. What am I doing wrong here?

distance_next_stop = [19.320592048800002, 73.8492150239, 162.16051086800002, 0.361037751915, 162.295311589, 0]
with arcpy.da.UpdateCursor("out_stops", "Dist_Next") as cursor:
    for row in cursor:
        row = distance_next_stop[i]
        cursor.updateRow(row)

The column "Dist_Next" in the feature layer "out_stops" that I want to update:

Your code doesn't declare or alter i. Try putting parens or braces around row, since a list is expected in the updateCursor method. Note that it isn't safe to assume that rows will always be processed in physical order. — Vince
– Vince, Commented Oct 26, 2021 at 14:59
In a specific line, or using (row) or {row} in line 3, 4, and 5? — Agnes
– Agnes, Commented Oct 26, 2021 at 15:07
Regarding declaring and altering, does that mean doing something like: for row in cursor: i = 0 row = distance_next_stop[i] i += 1 cursor.updateRow(row) — Agnes
– Agnes, Commented Oct 26, 2021 at 15:28

Bera · Accepted Answer · 2021-10-26 18:56:16Z

2

Use zip:

import arcpy

distance_next_stop = [19.320592048800002, 73.8492150239, 162.16051086800002, 0.361037751915, 162.295311589, 0]
with arcpy.da.UpdateCursor("out_stops", "Dist_Next") as cursor:
    for row, dist in zip(cursor, distance_next_stop):
        row[0] = dist
        cursor.updateRow(row)

Or enumerate:

...
for i, row in enumerate(cursor):
    row[0] = distance_next_stop[i]
...

edited Oct 26, 2021 at 18:56

answered Oct 26, 2021 at 16:07

Bera

82.4k14 gold badges86 silver badges201 bronze badges

1

Thank you! That did the trick - much appreciated!

Agnes
– Agnes

2021-10-26 16:47:16 +00:00
Commented Oct 26, 2021 at 16:47
1

Nice! Please accept my answer with the checkbox

Bera
– Bera

2021-10-26 18:54:38 +00:00
Commented Oct 26, 2021 at 18:54

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