I'm trying to resolve some weird (to me) problems with arcpy.Exists() I'm running AGP 3.0. I created a script that I'm running from a toolbox. I've searched for bugs and past posts. I've seen several other posts about problems with Exists() but nothing seems relevant to my situation.
The script takes 3 params. 2 of which may not exist. I'm using Exists to check.
If it's not there, I copy them from a template using FeatureClassToFeatureClass (later switched to CopyFeatures).
I don't want to overwrite param2 as that contains appended data collected through successive runs, but since it's not being detected, the script overwrites it.
Exists doesn't detect the FC, even when I can see it in the Catalog stored in the GDB.
My script (at the end of this post) prints out the workspace to verify it, twice.
If I copy my code and params into the immediate window, it works.
What am I not getting?
When I run the script multiple times, a yellow "!" appears letting me know that the FC exists.
I'm using full paths in the dialog box, but I tested the script first with basenames, later with full paths and there's no difference.
1) I print the workspace variable when the script first runs and see that it is the GDB that the files reside.
2) I run Exists next (it's false)
3) I run ListFeatureClasses, and the files I want aren't listed (even though they're in the catalog view)
4) I copy a template and store it in the names of param1 and param2
5) Exists finally sees it now, but not on the next run.
Other things I've done:
- Switched back to the default python environment. I'm running the script from either the toolbox and the immediate window.
- Switched the "FeatureClasstoFeatureClass" line with CopyFeatures. I believe that anything output by these is written to disk? There wasn't a noticeable affect between these two.
- I am defining an aprx variable with aprx = arcpy.mp.ArcGISProject("CURRENT") then defining the workspace as aprx.defaultGeodatabase I replaced it with a hardcoded value. no difference.
- I tried using full paths or basenames. No difference.
I'm running this in succession, so the files were just created by the previous run below.
p0= a point file (not being used. I commented out the execution of the payload)
p1 = Output_July22
p2 = AppendTo_2022
Files are there!
Files aren't there?!
I'm lead to believe that the workspace value isn't properly set?
Exists honors the workspace environment (thanks Tip!)
ListFeatureClasses uses the workspace setting.
The workspace is set in Analysis > Environments
It's set explicitly in code.
But when I switch to full paths there's no difference. Walk is using the workspace variable.
The files still aren't being shown. What's happening?
The code with all my redundant checks.
aprx = arcpy.mp.ArcGISProject("CURRENT")
aprxMap = aprx.listMaps("Map")[0]
# Parameters
param0 = arcpy.GetParameterAsText(0) # Geocoded Points
param1 = arcpy.GetParameterAsText(1) # File to output to
param2 = arcpy.GetParameterAsText(2) # File to append
arcpy.env.workspace = aprx.defaultGeodatabase
arcpy.AddMessage(f"Workspace is: {arcpy.env.workspace}")
arcpy.env.overwriteOutput = True
p1 = param1 #tried using basename(param1). No difference!
arcpy.AddMessage(f"p1 is {p1}")
p2 = param2
arcpy.AddMessage(f"p2 is {p2}")
if not arcpy.Exists(p1):
arcpy.AddMessage(f"Exists says {p1} doesn't exist")
else:
arcpy.AddMessage(f"Exists says {p1} exists")
if not arcpy.Exists(p2):
arcpy.AddMessage(f"Exists says {p2} doesn't exist")
else:
arcpy.AddMessage(f"Exists says {p2} exists")
paramExists = arcpy.ListFeatureClasses("*",feature_type="line")
arcpy.AddMessage(f"List Feature Classes: {paramExists}")
walk = arcpy.da.Walk(arcpy.env.workspace, datatype="FeatureClass")
for dirpath, dirnames, filenames in walk:
arcpy.AddMessage(f"From Walk: {filenames}")
if arcpy.Exists(p1):
arcpy.AddMessage(f"Exists: {p1}")
else:
arcpy.AddMessage(f"{p1} doesn't exist. Making from template")
arcpy.CopyFeatures_management("WF_Dist_To_Homes_template",p1)
if arcpy.Exists(p2):
arcpy.AddMessage(f"Exists: {p2}")
else:
arcpy.AddMessage(f"{p2} doesn't exist. Making from template")
arcpy.CopyFeatures_management("WF_Dist_To_Homes_template", p2)
#Checking that features were added
if not arcpy.Exists(p1):
arcpy.AddMessage(f"Exists says {p1} doesn't exist")
else:
arcpy.AddMessage(f"Exists says {p1} exists")
if not arcpy.Exists(p2):
arcpy.AddMessage(f"Exists says {p2} doesn't exist")
else:
arcpy.AddMessage(f"Exists says {p2} exists")
#verifying Workspace again
arcpy.AddMessage(f" Workspace: {arcpy.env.workspace}")
#Listing Feature Classes
arcpy.AddMessage(f"List FC: {arcpy.ListFeatureClasses('*', feature_type='line')}")
#Walk says:
walk = arcpy.da.Walk(arcpy.env.workspace, datatype="FeatureClass")
for dirpath, dirnames, filenames in walk:
arcpy.AddMessage(f"From Walk: {filenames}")
