Map a many to many relationship

JorgeBraque

Hello friends,
I used the tool "ArcToolbox>Data Management Tools>Relationship Classes>Table to Relationship Class" to establish a relation (many to many) between land parcels and owners. I already had the intermediate table. The question is how can i make a thematic map that shows the number of owners a parcel has?
For example:
light blue color=1 owner
darker blue=2 owners
dark blue=3+ owners

Thank you

JorgeBraque

import arcpy
from arcpy import env
def sumOwners():
    mxd=arcpy.mapping.MapDocument("CURRENT")
    wrkPath=mxd.filePath[0: mxd.filePath.rfind('\\')]
    env.workspace=wrkPath+"\\data.mdb"

    Pclass=wrkPath+"\\data.mdb\\contamination\\parcel"
    Rtable=wrkPath+"\\data.mdb\\owners2"

    Prows=arcpy.UpdateCursor(Pclass)
    Rrows=arcpy.SearchCursor(Rtable)

    nameLst=[]
    for i in Rrows:
        nameLst.append([i.getValue("P_No"),i.getValue("Owner_Name")])

    lst=[]
    s=""
    for i in Prows:
        code=i.getValue("Code")
        for j in nameLst:
            if code==j[0]:
                s+=j[1]+"\r"
        s=s[:-1]
        i.setValue("Owners", s)
        Prows.updateRow(i)
        s=""

Does anyone know how can i debug python scripts. The documentation of arcpy is so poor...