#!/usr/bin/env python

import persistent

class OutOfFunds(Exception):
    pass

class Account(persistent.Persistent):
    def __init__(self, name, starting_balance=0):
        self.name = name
        self.balance = starting_balance
    def __str__(self):
        return "Account %s, balance %s" % (self.name, self.balance)
    def __repr__(self):
        return "Account %s, balance %s" % (self.name, self.balance)
    def deposit(self, amount):
        self.balance += amount
        return self.balance
    def withdraw(self, amount):
        if amount > self.balance:
            raise OutOfFunds
        self.balance -= amount
        return self.balance