topic Locked File issue in arcpy loop in Python Questions

Locked File issue in arcpy loop

YonasKassa — Mon, 22 Nov 2021 08:00:18 GMT

Hi Everyone,

I am using the multiprocessing to generate multiple watershed. Each processor uses certain sets of watershed outlet points and the "for loop" to: (1) first generate the snap pour point using-- arcpy.sa.SnapPourPoint() , (2) save the resulted raster, (3) generate and save the watershed which uses the snap pour raster as input , 4) delete the snap pour raster and the watershed raster using arcpy.Delete_management (). The watershed deleted without a problem but the snap pour rasters are locked and can not be deleted. How can i release the lock and delete the file during each run of the loop without closing the program? I am using python 2.7. Many thanks,

Jonas

Re: Locked File issue in arcpy loop

DanPatterson — Mon, 22 Nov 2021 10:52:32 GMT

Do you have ....

arcpy.env.overwriteOutput = True

set in your script?

Re: Locked File issue in arcpy loop

YonasKassa — Mon, 22 Nov 2021 18:54:10 GMT

Hi Dan, Thank you. Yes, i have arcpy.env.overwriteOutput = True declared outside the loop. But still, the Snap pour raster is locked, even if the Watershed raster generated from it is not locked. I tried to generate the Snap pour raster through a function called within the loop. That way, i thought when the function return the raster it would release the lock. Saving the raster alone is not releasing it. The lock on the Snap pour raster is very persistent.

Re: Locked File issue in arcpy loop

DanPatterson — Mon, 22 Nov 2021 19:35:46 GMT

There isn't much that you can do about a python lock, if that is the cause

Re: Locked File issue in arcpy loop

YonasKassa — Mon, 22 Nov 2021 22:50:23 GMT

I believe there is always a way around to address such coding issue. It seems i have solved my problem by working on gdb instead of file directory. My initial code used file directories for the work and scratch space. I have changed that to gdb. The rest of the code is the same, for each loop run it generates Snap pour and watershed rasters save them now in gdb, get the watershed area using curse and then delete the curse (del curse) and the rasters using arcpy.Delete_management, repeat the loop for a different snap point.