mosaicfunc.py

def addraster_list_to_mosaicdataset(rasterlist, mosaic_dataset_path):
    """Use this function to add a list of rasters to a mosaic dataset
    
    Parameters:
        rasterlist : list
            List containing the paths to the rasters to be added to the mosaic
            dataset
        mosaic_dataset_path : str
            String of the path to the mosaic dataset to which the rasters
            will be added
    """
    length = len(rasterlist)
    for i, raster in enumerate(rasterlist):
        print 'Processing raster {} of {}'.format(str(i+1), str(length))
        arcpy.AddRastersToMosaicDataset_management(mosaic_dataset_path, input_path=raster)