topic Re: @ as a string decorator in Python? in ArcGIS Pro Questions

@ as a string decorator in Python?

ErikAnderson — Mon, 12 Jun 2023 18:50:04 GMT

I executed the arcpy.management.CalculateFields() tool in ArcGIS Pro and copied/pasted the Python Command to a text editor. In some cases, it prefixes the "fields" parameter with "@" as in fields = @"X !XY!.split("","")[0] #;Y !XY!.split("","")[1] #".

I'm unable to find anything that explains what the "@" is doing for the string value. The only uses I've found for it is as a matrix operator and for accessing SHAPE properties.

Re: @ as a string decorator in Python?

MapGrrl — Sat, 17 Jun 2023 00:11:43 GMT

It appears to be a "connector" to indicate that the following syntax is related to the SHAPE of the feature:

https://pro.arcgis.com/en/pro-app/latest/arcpy/get-started/reading-geometries.htm

Are the fields related to the geometry, by any chance? Like, the Shape, Shape_area, Shape_length, etc.? or are they descriptive attribute fields?

Re: @ as a string decorator in Python?

ErikAnderson — Tue, 20 Jun 2023 15:49:06 GMT

I used the CalculateFields() tool to set multiple fields, some of which were geometry-related. However, the "@" character appeared at the head of and outside the string.

Re: @ as a string decorator in Python?

Shaun-Walbridge — Tue, 15 Aug 2023 02:07:49 GMT

If you can share an example project with the behavior in the history, I think we can log this as a bug.

Cheers, Shaun