Cursors are used by database programmers to process individual rows returned by database system queries.

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16
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2answers
3k views

Exporting table to XYZ ASCII file via ArcPy?

I'm looking for a way to export an ArcGIS table (created with the Sample tool) to a text file via ArcPy. I can do this in ArcGIS via the context menu by right-clicking the table, but have not found ...
13
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2answers
649 views

How is the data access cursor performance so enhanced compared to previous versions?

The data access module was introduced with ArcGIS version 10.1. ESRI describes the data access module as follows (source): The data access module, arcpy.da, is a Python module for working with ...
9
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5answers
599 views

How to improve performance when using ArcGIS cursors in Python with big tables?

I have a pretty big point feature class in a file geodatabase (~4 000 000 records). This is a regular grid of points with a 100m resolution. I need to perform a kind of generalization on this layer. ...
7
votes
2answers
2k views

Getting unique value of second field using arcpy.da.SearchCursor?

I have a feature class and using arcpy.da.SearchCursor I'm getting unique values of a field (e.g. Name). How can I use this method to get the associated row value of a different field (diff field = ...
6
votes
3answers
2k views

Accessing attribute table within shapefile and replace values?

I would like to find a Python script that will access an attribute table within a shapefile and either update or replace records inside a field column. More specifically, I would like to use the ...
6
votes
5answers
300 views

How to access adjacent rows with cursor?

In the attached screenshot, the attributes contain two field of interest "a" and "b". I want to write a script to access the adjacent rows in order to make some calculations. To access a single row, ...
6
votes
3answers
783 views

Zero filling attributes using ArcPy/Python?

I am just learning python and I need to convert a 2 digit numeric attribute in a table to a 2 digit zero-filled attribute in a script. For example, 9 needs to be 09.
6
votes
2answers
277 views

What technology is used behind arcpy cursors?

I'm using ArcGIS Server 10.0. I have a geoprocessing using arcpy search, update and insert cursors. I'd like to know more about the technology behind these cursors. Does it use any driver or pool to ...
5
votes
1answer
1k views

Is it possible to sort an arcpy.da.UpdateCursor()?

I have an ArcPy Data Access update cursor that I would like to sort before making updates to it. The cursor makes updates if I don't sort, but if I add a sort to the cursor I get an error, ...
5
votes
1answer
670 views

“Sequence size” doesn't match row in Python?

Essentially I am trying to calculate a value for a couple of fields after adding them. Below you can see how I am adding the fields and then an example on how my "for" statement is looping through the ...
5
votes
1answer
183 views

How to add Attributes to a polygon with arcpy

I have a question about arcpy. I want to create a polygon FeatureClass with attributes. The code below is just test-code that generates some polygons for speed testing. I want to add some additional ...
5
votes
2answers
1k views

How to replace arcpy.CalculateField_management with an update cursor?

I'd like to replace this expression arcpy.CalculateField_management(bufferFile, "Shape_Area", "float('!shape.area@squaremeters!')", "PYTHON") with an arcpy.da.updatecursor. The reason for this is ...
4
votes
2answers
1k views

arcpy.SearchCursor row.var

In arcpy.SearchCursor for row in rows I can return row.fieldname statically, but if fieldname is a variable, I don't know how to return the row.value of that variable dynamically. for example: ...
4
votes
3answers
376 views

Using da.SearchCursor to get count of unique values in a field

Is it possible to use arcpy.da.SearchCursor() to get a count of unique features in a field without a dictionary? So, by this I mean if I have a field called TEXT which contains 10,000 rows populated ...
4
votes
2answers
318 views

Is it a bad idea to convert a File Geodatabase table to a dictionary?

First, what am I trying to do? I am building a Python script that should be called from an ArcMap 10.0 toolbox. This scripts uses (among other inputs) data contained in huge gdb tables. It processes ...
4
votes
3answers
689 views

How to create Where Clause from user input via Python list?

I am trying to perform a query based on values in a Python list. The where clause will then be used in an Update Cursor, so that the rows NOT equal to the values in the list will be deleted. This is ...
4
votes
3answers
2k views

How to extract data using arcpy.da.SearchCursor

I have a shapefile of point features showing fire locations in a given year. One of the fields is named "YYYYMMDD" and indicates the corresponding date that that fire happened. In Python, I am trying ...
4
votes
2answers
813 views

Getting XY coordinates and field values for each row in ArcPy SearchCursor?

I am trying to enumerate each row of a points shape file and get a certain field's value (elevation) and the xy coordinates. But I see I can only use: arcpy.SearchCursor to get the field; OR ...
4
votes
2answers
2k views

set values in feature class attribute table to null

I've created a point-data featureclass (fc) containing data from a simple .txt file using Arcpy as follows: arcpy.CreateFeatureclass_management(out_path= outPath, out_name= 'fcTest', geometry_type= ...
4
votes
2answers
2k views

insert cursor “Row contains a bad value”

I'm having a problem copying data from a shapefile to a feature class using an insert cursor. Here is the part that is causing trouble: newRows = arcpy.InsertCursor(Target) sourceRows = ...
4
votes
1answer
274 views

How to extract certain values from a table using the SearchCursor Tool

I am trying to write a python script to extract certain values from a table: the table I am referring to is a big collection of nitrate values for different water depths, which are deposited in the ...
3
votes
2answers
1k views

Moving cursor backward i.e. opposite of row = rows.next()?

Can anyone tell me if there is a way to go up one row in python cursor? i.e. opposite of row = rows.next()
3
votes
1answer
754 views

Arcpy Update Cursor (arcpy.da.UpdateCursor()) not saving changes to 'SHAPE@LENGTH'

Looked around and found other Cursor questions, but nothing dealing with updating 'SHAPE@LENGTH'. I am running ArcGIS 10.2.1 and have a multipoint shapefile that I am grouping into polygons based on a ...
3
votes
1answer
199 views

Arcpy.da.UpdateCursor, Error - Sequence size must match size of row

I am trying to use an UpdateCursor fill in a field but I keep getting an error, can anyone tell me what I am doing wrong? My code is below: import arcpy fc= "C:\Users\Keri\Desktop\GEP_690\Project ...
3
votes
1answer
3k views

Using ArcPy update cursor to replace <Null> value?

I have been combing the help associated with (None) values in arc, and have not been able to solve the following problem: I have a a field with mixed Null and integer values: 0 100 I would like ...
3
votes
2answers
764 views

How to calculate a value based on another field under arcpy.da.UpdateCursor and cursor.updateRow?

I am trying to do a calculations under arcpy.da.UpdateCursor. I want to calculate the values for the records that have FIPS=06037. I want to take the values from "kg" column and populate the new value ...
3
votes
1answer
228 views

Debugging TypeError: SearchCursor() got unexpected keyword argument in ArcPy script?

I tried to use SearchCursor(points, fields=fieldname) but I get this error: TypeError: SearchCursor() got an unexpected keyword argument 'fields' I'm not sure why this doesn't work. # Local ...
3
votes
2answers
732 views

ArcPy Data Access Insert Cursor not writing geometries to feature class?

I'm running ArcGIS 10.2.1 and am having troubles with the Insert Cursor in the arcpy module. I have an empty feature class in my geodatabase and have created the short script below to try and find the ...
3
votes
2answers
972 views

Using Select By Location to update field in feature class using ArcPy?

I am using Arc 10.1 and I am working on a script that takes a value from a field within one shape file and updates a field in another shape file based on its location. Basically I have smaller parcels ...
3
votes
2answers
2k views

Getting values from attribute table and inserting another table using ArcPy?

I have line feature class of a river network and “FromTo” table. Lines are dissolved so they are not segmented from junctions. I need to write a Python script in ArcGIS to do following: Begin from ...
3
votes
1answer
47 views

ArcMap Using Python to Rename a Feature Class based on Print Results

I would like to rename a feature class based on the EDITOR and DATE fields. I wrote this code: import arcpy fc = "C:\Users\PythonTesting.gdb\MyFile" f1, f2, f3 = "EDITOR", "DATE", "OBJECTID" ...
3
votes
1answer
736 views

Zoom to Shapefile attribute table row feature

I am working with the python code below in ArcGIS to zoom into a shapefile's attribute table row features without selected until the end of table one by one. I am trying to use this code but this one ...
3
votes
1answer
143 views

How to iterate through all geometries using a search cursor?

I would like to use a python add-in which uses a button click to iterate through each selected polygon one by one. The following code manages to zoom only to the first polygon. How can I adapt it to ...
3
votes
1answer
146 views

Copy multiple features in feature class, update field value based on number copied

I have created a field which will indicate the records I want to alter. What I want to do is then cycle through these records, each will contain sum values in a field.Based on the sum I want to copy ...
3
votes
1answer
55 views

Releasing Cursors using ArcObjects?

I am working with ArcObjects, in particular the ICursor Interface. I am creating a cursor and looping through a query's result set. My problem/concern is how to close or delete or release the cursor ...
3
votes
2answers
361 views

arcpy.SearchCursor loops one time but then does not repeat

The part of the script I'm having trouble with is the arcpy.SearchCursor. The cursor runs 1x and then does not re-run. The goal was to re-retrieve the field value and apply it to the image layout. It ...
3
votes
0answers
152 views

Basic arcpy script with cursors running SLOW!

I've got 2 polygons layers (no gaps): IDUs and crops. What I want is to identify the 3 largest crops by % area for each IDU. This seems common enough but I couldn't find a way to do it all using ...
2
votes
2answers
106 views

Proper syntax for Select Feature Layer by Location

Can someone let me know how I can use a single feature from one layer as the "Select Features" when using the Make Feature Layer by Location tool with another layer as the input? In the code below ...
2
votes
1answer
37 views

Calculate Row if Row Value Equals Value in List

I have a folder of photos named with a building ID that corresponds to a building ID in a building footprints feature class. Not all rows in the footprints feature class have a corresponding photo. ...
2
votes
1answer
38 views

How do I combine a wildcard command along with %s in a where clause statement?

I am trying to write a script where the user can search for a five digit zipcode using an input statement and a search cursor. The zipcodes in the file though are nine characters long (i.e. ...
2
votes
2answers
39 views

Debugging Cursor object has no attribute _exit_ from ArcPy?

I am trying to replace NULL values for -999 in a table inside a gdb. I know how to replace the value for individual fields, but get an error when looping through the complete table. import arcpy fc ...
2
votes
2answers
619 views

Use updatcursor to replace values in multiple fields

I have spent a couple days digging through forums here, ESRI help and elsewhere and each variation of the codes I have tried has not worked. As best as I can tell this is due to my attempt to loop ...
2
votes
2answers
770 views

Measure area of a polygon in specific units using ArcPy

I am trying to find the area of a particular polygon (OriginalPolygon, below), and I can do that... But, I'd like it in acres regardless of the original units of the polygon.(Data is coming into this ...
2
votes
2answers
97 views

How do I skip rows with searchcursor based on an interger value

For example, if I have 100 records, and I want to sample 10% of the records. How do I tell the search cursor in arc10 to read the value of the 9th record, or every 10. I tried to do row[0 + count] and ...
2
votes
2answers
74 views

Controlling default value of arcpy.AddField_management

I have a large collection of shapefiles that use text fields to hold numerical values. I have created new fields, and populated them with the numerical equivalent of the text field. When adding the ...
2
votes
1answer
237 views

Invalid SQL Error when using InsertCursor on table created using CreateTable

I am trying to write a list of items to a new table in Arc. When I attempt to add a new row to an Arc table, I get the following error: Runtime error Traceback (most recent call last): File ...
2
votes
1answer
554 views

Updating the value of a field with pre-defined values

I am trying change the value of a row for a field whose type is "short" in arcmap using a python script. with arcpy.da.UpdateCursor(FILENAME, FIELD) as cursor: for row in cursor: row = ...
2
votes
1answer
456 views

Am I over-complicating adding and then calculating fields? Suggestions for a better way? (Python)

I'm attempting to re-position a question I asked yesterday here. I am starting to think that the way I wrote my code just isn't the best way. Am I overcomplicating things? I know for a fact that ...
2
votes
1answer
269 views

Updating and inserting a field within the same loop

I am working with an empty feature class where I am writing a script to create polylines within the featureclass and attach an associated text value with the polyline. I am using a for loop as noted ...
2
votes
1answer
329 views

Using ArcPy to Read from Excel Spreadsheet to Python Dictionary

How would I go about creating a script that reads a specified excel spreadsheet and places the values in a dictionary? I have read about the xlrd library and how the library in such endeavors to read ...