contractlib [BUGGED]

code.py

class ContractPart:
    
    def __init__(self, nym, item, price, 
             sig, contract_exp=None):
        self.nym = nym
        self.item = item
        self.price = str(price)+"BTC"
        self.contract_exp = contract_exp
        self.sig = sig

    def json_conv(self):
        result = ""
        #convert above info into JSON,
        return result

    def xml_conv(self):
        result = ""
        #convert above info into xml, 
        return result

class BuyerPart(ContractPart): #here's one way I tried doing it.
    self.party = "buyer"
    def getParty(self):
        return self.party
    
class SellerPart(ContractPart): #here's one other solution i tried

    def __init__(self):
      self.party = "seller"
       
    def getParty(self)
      return self.party


john_doe = BuyerPart("John Doe", "teddy bear", "0.005")
john_doe.getParty()