I am trying to use an update cursor ina for loop and I keep getting an IOError that I don't understand.
The script is looping through my table, selecting records one by one, then doing a select by location to fins out how many buffers intersect the selected record. The number of buffers that intersect that record need to be recorded in the attribute table. A sub-set of my code and error statements are below.
Error Statement:
I'm not understanding why its saying IOError "0" does not exist. It's doing this on the very first record. The input value for this record should be 3. All fields that need to be populated currently have a value of 0. Field properties = double.
Thanks in advance
The script is looping through my table, selecting records one by one, then doing a select by location to fins out how many buffers intersect the selected record. The number of buffers that intersect that record need to be recorded in the attribute table. A sub-set of my code and error statements are below.
Code:
RCWfieldList = ["three_mi","avg_gs","PGB_avg","one_25mi","pot_hab"]
ParcelFieldList=arcpy.ListFields(parcelsFC)
for RCWfield in RCWfieldList:
if RCWfield in ParcelFieldList:
print "Field", RCWfield, "found in", parcelsFC
arcpy.AddMessage("Field " + RCWfield + " found in " + parcelsFC)
else: # else the fieldname is not yet a field in the table, field will be added
print"Field", RCWfield, "NOT found in", parcelsFC
arcpy.AddMessage("\nField " + RCWfield + " NOT found in " + parcelsFC)
arcpy.AddField_management(parcelsFC, RCWfield, "DOUBLE")
print RCWfield, "created"
arcpy.AddMessage(RCWfield+" created/n")
#Select out each parcel record one by one and evalauate how many cluster buffers intersect with that parcel.
#Update Parcel Attribute Table field three_mi with the # of buffers that intersect that parcel
for parcel in range(0,1092):
FID = "FID=%s" % (parcel)
arcpy.SelectLayerByAttribute_management(parcelsFL,"NEW_SELECTION",FID)
arcpy.SelectLayerByLocation_management(CbuffersFL,"INTERSECT",parcelsFL)
bufferCount = int(arcpy.GetCount_management(CbuffersFL).getOutput(0))
uc=arcpy.UpdateCursor(parcel)
for line in uc:
line.three_mi = bufferCount
uc.updateRow(line) #Actually changes the table values to buffer count
del line
del uc
#print "There are", bufferCount, "buffers that intersect with parcel FID #", FID
arcpy.SelectLayerByAttribute_management(parcelsFL,"CLEAR_SELECTION")Code:
Traceback (most recent call last):
File "P:\Environmental Division\The Nature Conservancy\TNC GIS Data\TNC GIS Projects\RCW\Code\ForLoop.py", line 68, in <module>
uc=arcpy.UpdateCursor(parcel)
File "C:\Program Files\ArcGIS\Desktop10.0\arcpy\arcpy\__init__.py", line 841, in UpdateCursor
return gp.updateCursor(*args)
File "C:\Program Files\ArcGIS\Desktop10.0\arcpy\arcpy\geoprocessing\_base.py", line 362, in updateCursor
self._gp.UpdateCursor(*gp_fixargs(args)))
IOError: "0" does not existThanks in advance