mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd, "Callejero_DP")[0]
for pageNum in range(1, mxd.dataDrivenPages.pageCount + 1):
   mxd.dataDrivenPages.currentPageID = pageNum
   PageName = mxd.dataDrivenPages.pageRow.Layer
   arcpy.mapping.ExportToPNG(mxd,
            r"K:\Apb\Cuadricula_A3\Formato_png\ideS_Guia_Urb_" + str(PageName) + ".png",
            data_frame = "PAGE_LAYOUT",
            df_export_width = 4959,
            df_export_height = 3509,
            resolution = 300,
            world_file = False,
            color_mode = "24-BIT_TRUE_COLOR",
            background_color = "255, 255, 255",
            interlaced = False)
del mxd