summarize within arcpy

#-------------------------------------------------------------------------------
# Name: SummarizeWithin.py
# Description: Summarize river polylines by counties.

# Import system modules
import arcpy

arcpy.env.workspace = "C:/data/RedRiver_basin.gdb"

# Set local variables
summarizedLayer = "Rivers"
summaryPolys = "Basins"
summaryStatistics = [["Width", "MEAN"]]
weighedSummaryStatistics = [["DOC", "SUM"]]
out = 'SummarizedRivers'


# Execute SummarizeWithin
arcpy.gapro.SummarizeWithin(summarizedLayer, out, "POLYGON", None, 
                            None, summaryPolys, "ADD_SUMMARY", 
                            "KILOMETERS", summaryStatistics, 
                            weightedSummaryStatistics)

arcpy.gapro.SummarizeWithin(summarized_layer, out_feature_class, polygon_or_bin, bin_type, {bin_size}, {summary_polygons}, sum_shape, {shape_units}, {standard_summary_fields}, {weighted_summary_fields}, {group_by_field}, {add_minority_majority}, {add_percentages}, {group_by_summary})