using arcpy.Merge_management

Question

This script should make a field for all the feature classes in a geodatabase, populate the new field with the name of the feature class it's being created in, and then merge all the feature classes together. However, when I run the code I get the success message but only the first feature class features are in the output of the merged feature class.

import arcpy, os
arcpy.env.workspace = r"J:\Non_RS_MXDs\Crown_Scrap.gdb"
for fc in arcpy.ListFeatureClasses():
 arcpy.AddField_management(fc, "DyRt", "TEXT", field_length = 30)
 with arcpy.da.UpdateCursor(fc, "DyRt") as cursor:
 for row in cursor:
 row[0] = fc
 cursor.updateRow(row)
fClasses = []
i = 0
try:
 fcs = arcpy.ListFeatureClasses()
 for fc in fcs:
 print fc
 fClasses.append(fc)
 i = i+1
except Exception as err:
 arcpy.AddError(err)
 print err
try:
 arcpy.Merge_management([fClasses], "Rts_8_15")
 print "merge: SUCCESS!"
 #count number of new features
 result1 = int(arcpy.GetCount_management("Rts_8_15").getOutput(0))
 print result1
except Exception as err:
 arcpy.AddError(err)
 print "merge: FAIL :("
 print err

Answer 1

You are creating a nested list which is probably throwing off the tool. Try changing the line where you are calling the merge to:

arcpy.Merge_management(fClasses, "Rts_8_15")

You may also want to add a print statement to show how many feature classes you are merging.