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Export Page Layout to PNG, type 'exceptions.AssertionError'

Question asked by mpeters83 on Apr 11, 2013
Latest reply on Apr 12, 2013 by mpeters83
I'm using ArcGIS 10.0 sp5 on a Win7 PC and need help with a script to turn layers on/off and export the page layout to an image file. The script works until the ExportToPNG(). I have 281 layers with up to 10 attributes I have to map (static extent) so scripting the arduous task of changing each layers visibility is preferred. I have a VBA tool to change the symbology between the 10 attributes of selected layers and now I'd like to take advantage of the arcpy.mapping functionalities.

import os, sys, string, arcpy  # define list of species spLst = ['0070','1320']  try:     mxd = arcpy.mapping.MapDocument(r"C:/Workspace/Species.mxd")      # check for broken paths     brknList = arcpy.mapping.ListBrokenDataSources(mxd)     if len(brknList) >= 1:         print "Broken Paths Exist..." + brknList     else:         for sp in spLst:             print "No broken paths, proceeding"             lyrName = "ew20km_in" + str(sp) + "_2040"                          lyrList = arcpy.mapping.ListLayers(mxd, lyrName)                          for lyr in lyrList:                                  # define variables                 out_png1 = r"C:/Workspace/pixels_500/rfbird_" + str(sp) + "_2040.png"                 out_png2 = r"C:/Workspace/pixels_800/rfbird_" + str(sp) + "_2040.png"                 resolution1 = 45                   resolution2 = 72                                  lyr.visible = True # make layer visible, all other species should start as invisible                                  arcpy.RefreshTOC()                 arcpy.RefreshActiveView()                                  # export current layout view to png file                 # ExportToPNG (map_document, out_png, {data_frame}, {df_export_width}, {df_export_height}, {resolution}, {world_file}, {color_mode}, {background_color}, {transparent_color}, {interlaced})                                  arcpy.mapping.ExportToPNG(mxd, out_png1, "PAGE_LAYOUT", "", "", resolution1, "", "24-BIT_TRUE_COLOR", "", "", "")                 arcpy.mapping.ExportToPNG(mxd, out_png2, "PAGE_LAYOUT", "", "", resolution2, "", "24-BIT_TRUE_COLOR", "", "", "")                                  lyr.visible = False  except:     arcpy.AddMessage(arcpy.GetMessages(2))     print arcpy.GetMessages (2)     print "Exited with Errors.... Something is wrong"