Purpose of "#" value in arcpy.AddRastersToMosaicDataset

[LanceCole]

I am updating some raster data and related processing scripts.  In the code reference guide Add Rasters To Mosaic Dataset (Data Management) a value of "#" is utilized for some parameters.  What is the intent of this value vs ""?  Does it indicate to use the default value for the parameter?

import arcpy
arcpy.management.AddRastersToMosaicDataset(
     "c:/data/AddMD.gdb/md_landsat", "Landsat 7 ETM+", 
     "c:/data/landsat7etm", "UPDATE_CELL_SIZES", "UPDATE_BOUNDARY",
     "UPDATE_OVERVIEWS", "2", "#", "#", "GCS_WGS_1984.prj",
     "*.tif", "SUBFOLDERS", "EXCLUDE_DUPLICATES",
     "NO_PYRAMIDS", "NO_STATISTICS", "BUILD_THUMBNAILS", 
     "Add Landsat L1G", "FORCE_SPATIAL_REFERENCE",
     "NO_STATISTICS", "", "USE_PIXEL_CACHE", 
r"C:\test\cachelocation")

[Anonymous User · Accepted solution]

"#" is generally seen when exporting geoprocessing history/ models to python and says no parameter was set.  It's performs the same as '' or None.

[DanPatterson]

The alternative is to use "named" parameters rather than "positional"

Obviously more useful if you only want to specify a couple of optional parameters and you are using defaults between them.

import arcpy
arcpy.management.AddRastersToMosaicDataset(
     in_mosaic_dataset="c:/data/AddMD.gdb/md_landsat",
     raster_type="Landsat 7 ETM+", 
     input_path="c:/data/landsat7etm",
     maximum_pyramid_levels="2",
     spatial_reference="GCS_WGS_1984.prj",
     filter="*.tif",
     duplicate_items_action="EXCLUDE_DUPLICATES",
     operation_description="Add Landsat L1G",
     force_spatial_reference="FORCE_SPATIAL_REFERENCE",
     "NO_STATISTICS", "",
     enable_pixel_cache="USE_PIXEL_CACHE", 
     cache_location=r"C:\test\cachelocation"
)