Performing Project_management in batch using ArcPy?

Question

import arcpy
import os
fc = []
walk = arcpy.da.Walk('C:/Wiley/P1/gis/OSM.gdb')
outdir = "C:/Wiley/P1/gis/HK80.gdb/osm"
for root, dirs, datasets in walk:
 for ds in datasets:
 fc.append(os.path.join(root, ds))
if fc:
 output = os.path.join(outdir, os.path.basename(ds) + "_project") 
 hkfc = "C:\Wiley\P1\gis\HK80.gdb\Building_merge_dissolved"
 # Describe the feature class and get its spatial reference
 desc = arcpy.Describe(hkfc)
 spatialRef = desc.spatialReference
 out_coordinate_system = arcpy.SpatialReference('spatialRef.name')
 arcpy.Project_management(fc, output, out_coordinate_system) 

I am sure with a trained eye you guys know what to do. It came back to me with the following error:

Runtime error Traceback (most recent call last): File "", line 21, in File "c:\program files (x86)\arcgis\desktop10.4\arcpy\arcpy\arcobjects\mixins.py", line 962, in init self._arc_object.createFromFile(item) RuntimeError: ERROR 999999: Error executing function.

What went wrong?

Answer 1

I assume you want to loop through all the feature classes you're collecting, so it should be:

# we only need to do this once
hkfc = "C:\Wiley\P1\gis\HK80.gdb\Building_merge_dissolved"
desc = arcpy.Describe(hkfc)
spatialRef = desc.spatialReference
for input in fc:
 output = os.path.join(outdir, os.path.basename(input) + "_project") 
 arcpy.Project_management(input, output, spatialRef) 

The way you're using walk is a little awkward but should be functional.

• Wiley Ng: Thx for your answer!! I will try it tmr!
• Wiley Ng: Alright I understand now. Always use the variables inside the for function.