buying_power.py

def calc_sale(price, realtor=True, closing=0.03, mortgage=148000):
    if realtor:
        realtor = 0.05
    else:
        realtor = 0.00
    cost = price * (closing + realtor) + 450
    rtn = price - cost - mortgage
    return rtn


def calc_buy(down_payment, percent_down=0.05):
    return down_payment / percent_down


def calc_sale_range():
    print("{:12}  | {:12}  | {:12}".format('Sale price',
                                           'Return',
                                           'Max purchasing power')
          )
    for price in range(160000, 185000, 5000):
        rtn = calc_sale(price)
        down = calc_buy(rtn)
        print("${price:12,.2f} | ${rtn:12,.2f} | ${down:12,.2f}"
              .format(price=price, rtn=rtn, down=down))


if __name__ == '__main__':
    calc_sale_range()