topic Re: Script to loop through Multiple Datasets in Python Questions

Script to loop through Multiple Datasets

SteveKim1 — Thu, 17 Feb 2022 23:20:32 GMT

Hi Everyone,

Is there a script where I can run through multiple datasets in a gdb.

For example: I want to add fields to every feature class which is grouped in their respective datasets.

Thanks!

Re: Script to loop through Multiple Datasets

AlfredBaldenweck — Thu, 17 Feb 2022 23:34:43 GMT

Yup, there is. See here ListFeatureClasses—ArcGIS Pro | Documentation, ListDatasets—ArcGIS Pro | Documentation

arcpy.env.workspace = [whatver your workspace is] FClist = arcpy.ListFeatureClasses() for FC in FClist: code code #if using data sets arcpy.env.workspace = [whatver your workspace is] FDList = arcpy.ListDatasets() for FD in FDList: FClist = arcpy.ListFeatureClasses() for FC in FClist: code code

Re: Script to loop through Multiple Datasets

JoshuaBixby — Fri, 18 Feb 2022 15:17:45 GMT

Use Walk—ArcGIS Pro | Documentation, much more Pythonic than the older List functions. The documentation has some working examples.

Re: Script to loop through Multiple Datasets

SteveKim1 — Fri, 18 Feb 2022 15:57:50 GMT

Thanks Alfred for the script! When I use the second script to loop through the Datasets and then through each Feature Class, the ListFeatureClasses() function is not returning any values. Here's my script below:

Did I miss any steps or anything wrong with this code?

Thanks!

Re: Script to loop through Multiple Datasets

AlfredBaldenweck — Fri, 18 Feb 2022 16:23:43 GMT

Oooh, I had no idea this existed. Thanks, I'll have to try this out!

Re: Script to loop through Multiple Datasets

AlfredBaldenweck — Fri, 18 Feb 2022 17:26:35 GMT

Oops, it looks like I should have read the documentation more closely.

What happened was that ListFeatureClasses just grabs everything from the workspace, ignoring the stuff in datasets, unless you specify that you want the stuff in the datasets.

You may also want to try out Walk(), like Joshua suggested.

arcpy.env.workspace = r'=...\Data_Transfers.gdb' field1 = "LATITURE" #These are mispelled field2 ="LONGITURE"#These are mispelled FDlist = arcpy.ListDatasets(feature_type='feature') #The parameter in here isn't strictly necessary print(FDlist) '''if you want to include all feature classes, regardless of wheteher they're in a dataset.''' #FDlist = [''] + FDlist if FDlist is not None else [] for FD in FDlist: FClist= arcpy.ListFeatureClasses(feature_dataset = FD) for FC in FClist: print(FC) if not (field1 in arcpy.ListFields(FC) and (field2 in arcpy.ListFields(FC))): FC = arcpy.management.AddField(FC, field1, "DOUBLE",field_alias = "Lat") FC = arcpy.management.AddField(FC, field2, "DOUBLE",field_alias = "Long")