title: Getting an error when using python and arcpy to delete data in a geodatabase
body: <p>I am trying to use delete_management to delete files in a gdb based on whether or not they are in a list. I keep getting an error with the delete_management tool that says the file either does not exist or is not valid. I can't figure out what the problem is?</p>
  
  <pre><code>import arcpy, os, easygui, sys
  mxd_path = easygui.enterbox("Enter directory where mxds are located:",title='Search for Data Sources')
  lyr_lst = []
  lyr_lst_files = []
  fl_nm_lst = []
  FCList = []
  RList =[]
  #out_loc = easygui.enterbox("Enter ouput directory for copying files:")
  out_loc = r'C:\GIS\Assimilate_Mxd_Data\Assimilate_Mxd_Data_TESTING\Output Data\test_output.gdb'
  
  #set mxd and output geodatabase directory paths, exit if not specified
  if mxd_path == None or mxd_path == '':
      sys.exit()
  if out_loc == None or  out_loc == '':
  sys.exit()
  
  
  #generate a list of feature classes and a list of rasters already exist in
  #output geodatabase
  for gdb, fd, fc in arcpy.da.Walk(out_loc,datatype='FeatureClass'):
      for f in fc:
          FCList.append(f)
  for gdb, fd, rasters in arcpy.da.Walk(out_loc,datatype='RasterDataset'):
      for rstr in rasters:
          RList.append(rstr)
  
  #walk through mxds in mxd path and generate unique list of layers sourced in all
  #mxd documents
  for dirpath, dirnames, filenames in os.walk(mxd_path):
      for filename in filenames:
          fullPath = os.path.join(dirpath, filename)
          basename, extension = os.path.splitext(filename)
          if extension == ".mxd":
              mxd = arcpy.mapping.MapDocument(fullPath)
              LyrList = arcpy.mapping.ListLayers(mxd)
              for item in LyrList:
                  if item.supports("DATASOURCE"):
                     lyr_lst.append(item.dataSource)
  
  lyr_lst_unique = list(set(lyr_lst))
  
  #retrieve file names without extension from unique mxd layers lists, to compare
  #with contents of output gdb
  for lyr in lyr_lst_unique:
      path, file = os.path.split(lyr)
      fl_nm = os.path.splitext(file)[0]
      fl_nm_lst.append(fl_nm)
  
  #compare file names in lyr_list_unique to lists of feature classes and rasters that
  #already exist in output gdb. If file names are not in FCList and RList, meaning
  #they do not already exist in the gdb, copy files to output gfb
      if fl_nm not in FCList and fl_nm not in RList:
          try:
              arcpy.FeatureClassToGeodatabase_conversion(lyr,out_loc)
          except:
              print 'Input file ' + lyr + ' is not a feature class'
              try:
                  arcpy.RasterToGeodatabase_conversion(lyr,out_loc)
              except:
                  print 'Input file ' + lyr + ' is not a feature class or a raster'
  
  
  #compare file names in fl_nm_list to lists of feature classes and rasters that
  #already exist in output gdb. If files exist in gdb that are not found in mxd
  #unique layers list, delete
      for gdb, fd, fc in arcpy.da.Walk(out_loc):
          for f in fc:
              if f not in fl_nm_lst:
                  arcpy.Delete_management(f)
  </code></pre>