Tag Maps label placement animation

# coding=utf-8
import arcpy, os

def unique_values_where(table , field, where_clause):
    """Get values from table for specific field in descending order, 
       optional include a limiting where query
    """
    with arcpy.da.SearchCursor(table, [field], where_clause) as cursor:
        return list(reversed(sorted({row[0] for row in cursor})))
        
# Specify output path and final output PDF
out_path = r"C:\temp\out"

# Specify the map document and the data frame
mxd = arcpy.mapping.MapDocument(
    r"CampusMap_MapSeries.mxd")

ix = 0
for layer_ref in ["Top10", "HImp", "Other"]:
    layer = arcpy.mapping.ListLayers(mxd, layer_ref)[0]
    layer.visible = True
    
    def_query_old = layer.definitionQuery 
    # print "def query: " + def_query_old
    
    # now we need to get the unique values for "Join_Count"
    # and use those to loop over Definition Query,
    # starting with the smallest values (for Photo Count)
    values_source = layer.dataSource
    
    # process top10 first
    unique_values = unique_values_where(
        values_source, "Weights", def_query_old)
    print len(unique_values)
    print unique_values[0]
    
    # set what is given in mxd layers
    if layer_ref == "Top10":
        base_query = '"HImpTag" = 1 AND "Weights" >='
    elif layer_ref == "HImp":
        base_query = '"HImpTag" = 1 AND "Weights" < 300 AND NOT "FID" = 6232 AND NOT "FID" = 2361 AND "Weights" >='
    else:
        base_query = '"HImpTag" = 0 AND "Weights" < 200 AND "Weights" >='
        
    for unique_value_step in unique_values:
        def_query_new = base_query + str(unique_value_step)
        layer.definitionQuery = def_query_new
        print def_query_new
        arcpy.mapping.ExportToPNG(mxd, out_path + r"\map_" + "%03d" % (ix,) + ".png")
        ix += 1

# clear memory/close the map
del mxd